After registering your account, click on the search bar on the top left, enter the creator's UID, and if they are already on UniFans, you can go subscribe to one of their plans to support them. Creator's UID can be found under their homepage under their name.
If your favorite creator is not yet on UniFans you can invite them to become a UniFans creator~ Also, if a creator shares a link to his/her UniFans page on social media or other platforms, click on the link to support them and don't forget to register your own account!