After you've gotten approved for a spending limit....Just choose the item you want from their site, or use Amazon or any of the affiliated retailers they're associated with.
The item will be shipped directly to you, and you get a 3 month same as cash price plus $50 processing fee... After 3 months they add on a rental fee which is ALOT... So I urge you to pay it off within 3 months.
They automatically divide the payment up and deduct that amount every Friday from your account, but I believe you can call them and have it set to every other week.
If you want to pay more or pay it off you have to call and make a payment. Which is rather inconvenient but easy nonetheless. I've never been on hold for more than a minute.
Then as soon as you've paid it off, your full spending limit is ready the very next day... I just paid off my first item last night and about to order the next as we speak.