Added guide on submitting amb confirmations manually

docs/bridges/tokenbridge/amb-bridge.md

@@ -80,12 +80,14 @@ References:
 |-------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------|
 | AMB/Omnibridge Multi-Token Mediator | [0x88ad09518695c6c3712AC10a214bE5109a655671](https://etherscan.io/address/0x88ad09518695c6c3712AC10a214bE5109a655671#writeProxyContract) |
 | AMB Contract Proxy (Foreign)        | [0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e](https://etherscan.io/address/0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e#writeProxyContract) |
+| AMB/OmniBridge wETH Router Helper | [0xa6439Ca0FCbA1d0F80df0bE6A17220feD9c9038a](https://etherscan.io/address/0xa6439ca0fcba1d0f80df0be6a17220fed9c9038) |
 
 ### Gnosis
 | Contract                            | Address                                                                                                                                   |
 |-------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------|
 | AMB/Omnibridge Multi-Token Mediator | [0xf6A78083ca3e2a662D6dd1703c939c8aCE2e268d](https://gnosisscan.io/address/0xf6A78083ca3e2a662D6dd1703c939c8aCE2e268d#writeProxyContract) |
 | AMB Contract Proxy (Home)           | [0x75Df5AF045d91108662D8080fD1FEFAd6aA0bb59](https://gnosisscan.io/address/0x75Df5AF045d91108662D8080fD1FEFAd6aA0bb59#writeProxyContract) |
+| AMB Helper Contract                 | [0x7d94ece17e81355326e3359115D4B02411825EdD](https://gnosisscan.io/address/0x7d94ece17e81355326e3359115D4B02411825EdD#readContract)       |
 
 ## How it works
 ### Terminology

docs/bridges/tutorials/using-amb.md

@@ -2,11 +2,24 @@
 title: Using the AMB
 ---
 
-## Basics
+## Submitting AMB Confirmations Manually
+The Arbitrary Message Bridge between the Ethereum Mainnet and the xDai chain now requires a [request-and-claim scheme](https://forum.poa.network/t/request-and-claim-to-transfer-assets-from-xdai-chain/4495) to transfer data from the xDai chain, and some users and applications may want to use a manual process to gather the oracles confirmations and send them to the AMB contracts on the Mainnet side.
 
-## Validators
+:::info
+This approach is the equivalent of the set of actions performed by the [OmniBridge UI](https://omni.gnosischain.com/bridge) after pressing the "Claim" button, or by the [AMB Live Monitoring app](https://alm-xdai.herokuapp.com/) after pressing the "Execute" button.
+:::
+Below is the list of actions that can be executed in BlockScout and Etherscan, or, if you are familiar with the contract interaction through Web3 provider, it can be done by importing the contract's ABI to your application.
+1. Find the first transaction which initiated message passing through the AMB bridge and go to the logs generated during the transaction execution. The `encodedData` argument emitted with the `UserRequestForSignature` event will be used in the next steps. 
+![](/img/bridges/amb_manualconfirmation_userRequestForSignature_encodedData.png)
+2. Go to the [AMB helper contract](https://gnosisscan.io/address/0x7d94ece17e81355326e3359115D4B02411825EdD#readContract) and call `getSignatures()` there with the encoded data from the `UserRequestForSignature` event. It will produce a blob with signatures.
+![](/img/bridges/amb_helper_getsignatures.png)
+3. Pass the encoded data and the signatures to the [Arbitrary Message Bridge contract](https://etherscan.io/address/0x4C36d2919e407f0Cc2Ee3c993ccF8ac26d9CE64e#writeProxyContract)'s `executeSignatures()` function on the Ethereum Mainnet and press the "Write" button to send the transaction.
+![](/img/bridges/amb_eth_executeSignatures.png)
+
+:::info
+MetaMask will show a high gas estimate for this transaction. In most cases the final gas consumption will be significantly lower.
+:::
 
-- [Tokenbridge Docs: Submitting AMB Confirmations Manually](https://docs.tokenbridge.net/eth-xdai-amb-bridge/about-the-eth-xdai-amb/submit-confirmations-manually)
 
 ## Deploying custom ERC-20 Bridge