How to upgrade my account?

I'm trying to figure out how to upgrade, but I can't figure out how to do it. Can someone help me? I have a safebooru account and I made a stripe account, but I have no idea how to pay safebooru.

Go to the following link...

https://safebooru.donmai.us/user_upgrade/new

Scroll to the bottom, and select to either upgrade to gold or platinum.

Ah, my ad blocker was blocking the buttons!