If you have the Patreon role in the support server, no further action is required. If not, return to your Patreon profile settings and disconnect your Discord account. Then reconnect it and check again. (Most people have to do this at least once.)
If you don't have the Super Cute role or a role from a higher Patreon tier, you will not be given your silver reward, regardless of whether or not you have donated.
If you're having trouble getting your role in the support server, check to make sure your donation payment went through.