How to exchange USO for ETH via web wallet?
1. Open https://wallet.usoamic.io:

 
2. Click "Add" if you want to add an existing wallet or "Create" if you want to create a new one:
2.1. Choose the second option and click "Create":

 
2.2. Click "Next" and fill in the fields:

 
3. Eransfer ETH and USO to the wallet (for example, from swap platform) and wait for their receipt to the account:

 
4. Go to the "Exchange" tab and fill in the fields:

 
5. Click on the "Exchange" button and wait for a window with a tx id.
 
6. Look at the status of the transaction at EtherScan.

 
7. Congratulations, you have exchanged your USOs for ETH.