To set up a contribution to the forum, open your account profile at the top right of the main forum screen and navigate to "Account Details".

There, you will see an option for "Account Upgrades".

You will be presented with a menu of purchasable donations. There are two types: one-time and recurring. Click the one you want, pay through Paypal and you'll see your shiny new supporter badge on your profile!

One note- the forum importer manually assigned you to your old supporter level, so to avoid having two badges on your avatar, let me or another admin know and we can manually remove you from your old status.
For vendors, you can purchase your vendor subscriptions from the same place.

There, you will see an option for "Account Upgrades".

You will be presented with a menu of purchasable donations. There are two types: one-time and recurring. Click the one you want, pay through Paypal and you'll see your shiny new supporter badge on your profile!

One note- the forum importer manually assigned you to your old supporter level, so to avoid having two badges on your avatar, let me or another admin know and we can manually remove you from your old status.
For vendors, you can purchase your vendor subscriptions from the same place.