When the app is first installed or updated, a link will open automatically to the Adblock website that asks for donations. YOU DO NOT HAVE TO DONATE and can simply close the page. The page looks like this.
If for some reason you are unable to access a website because of Adblock, you can simply pause Adblock or chose not to run for that site. Click the Adblock icon in the upper-right corner and select either “Pause on this site” or “Don’t run on pages on this site” and then refresh the page.