Off Topic is pretty much the best place for this. Regardless, you're probably just looking for a PayPal payment widget of some sort.
Yeah, if all you want is a page to accept donations, you just make a paypal account, and somewhere on their site is a thing to generate a donate button, and it gives you HTML code you just paste onto your page
With that, you'll have to manually check your paypal account for donations, and manually apply donator rank.
If you want something to automatically apply rank when a donation is received, you'll need a server-side script in something like PHP, a database to store donation status, and a web server (any paid service, and some free services) that offer these
