PayPal checkout does not appear

Hi!

I’ve installed Paid Member Subscriptions on my website and activated the PayPal Pro&Express-addon, but the checkout does not appear when you try to register a new subscribtion.

Here’s the register-page:
https://phinode.com/register/

I’ve filled in my PayPal-email adress and API-password and signature, and activeted IPN on my PayPal-account.

What am I missing?

https://wordpress.org/plugins/paid-member-subscriptions/