Budypress subscription form doesn't working

Hello i have both Membership and Buddypress plugin, i'm trying to set up the subscription but it's not working.
My goal is to link the subscription form with the gateway payment, the workflow should be:
fill the form > go the paiement page (paypal) > recieve the activation code > activate.
I've set Buddypress as shown in the first pic, i have add in the page Adhesion page the tag [subscriptionform] .
but the button at the end of the subscription form it's not leading to the payment page (with paypal),
what did i miss in the setup?
Is my scenario for registration incorrect?
Thanx