Add information to the account upgrades page to explain things like tax, invoicing refund policies, etc. There are two information blocks you can add - one above and/or one below below the "Available upgrades" list. Both are optional - leave the body blank to hide the entire block. Example...

Some words about upgrades

Description: Create a membership page and customize it with tons of settings and styling options. *note: Proceed button on the pack item on the membership page leads to the user account upgrade page or to the website URL that you have specified in the options. You can't point it directly to the...