Open Bridge Wallet and go to the Ether (ETH) screen. You must use Ether even if you want to cancel the transaction of another ERC20 token (USDT, USDC, etc.).
Basically, you are going to make a transaction to yourself, with a higher gas price.
To do so, click the "Send" button.
Fill the transaction as follows:
Open the "Advanced" menu and enter the following parameters:
Once that new transaction will have gone through (you can check its status in your Activity tab), your previous stuck transaction will be cancelled.
You can then proceed to re-send your initial transaction that got stuck in the first place (if you want to), with an adjusted gas price if needed.