If you aren't aware how to connect your wallet, you can see the instructions here
Choose the token you want to buy by selecting from the "To" list. If you don't see the token in the default list, please get the BSC contract address of the token to find it.
In the "From" list, provide the coin or token you want to spend (sell).
In this case, we will be buying wXDN with BNB. So this is how the screens looks like:
Click on "Confirm" button and you get your wXDN in the wallet.