When you open the application, DApps should be the default page (if not, click to the DApps page).
Half way down the page you'll see a list of networks to choose from. Click BSC.
On the list of BSC DApps, you'll find Wateenswap links. Click a Wateenswap link.
Make sure you don't choose the "Wateenswap data analysis" option. If you do, you will not be able to connect.
Your browser will open a Wateenswap tab and attempt to connect to Token Pocket.
You will not be able to use both MetaMask and TokenPocket connecting through the same web browser. Make sure you use a web browser without MetaMask plugin installed if you're using TokenPocket on your desktop computer.