Where do you live? You might not be able to use PayPal yet. You need to be at premium or ambassador level to use PayPal if u live in the US or Canada. At least it always used to be like that, they did mention making paypal available to everyone but not sure if they ever put that into effect. You'd have to contact customer service or use the q & a bot to find out.
At basic level once you're @ or above 2500 pts ($25.00 USD) the request a payment button is activated. However you can request a payment for any amount of points from 1000 to how ever many points u have it doesn't have to be for 2500 points.
The request payment button becomes active when you have 2000 points @ verified level, 1500 @ premium & 1000 @ ambassador.