To search for a token, click the Search box in the menu and type the token's name.
Depending on the device you are using, you might not see the same layout - it's located in the menu section, though.
Next, click the token from the populated display after you've typed in the token's name.
A page will load about the selected token.
If you are logged in and a paying customer, you will be able to search for any token you want.
If you're not logged in, you can only search for Bitcoin.
There is a lot you will find about a token on this page.