Open your Trust Wallet app, click on the Ethereum section to open your Ethereum wallet

Go to your browser, Safari on iOS or Chrome on Android (default browsers seem to handle the connection better than third party browsers like Brave), navigate to app.pooltogether.com and click on Account at the bottom. A popup will appear, click on Connect wallet and then click on Trust Wallet.

A new Wallet Connect popup should appear, click on the Open or install Trust Wallet, another popup appears, click on Open. It should now switch to your Trust Wallet app and display another popup, click on Connect.

It should open a Loading popup, once it has connected to PoolTogether, you can go back to your browser and your wallet should be connected.

Check on the top right corner of the app to see the initial digits of your wallet address.