please i need help in connecting my word press with a paid membership plugin

simply i want to add 2 buttons in my menu the first one is for a paid membership in a NGO in Egypt i want 2 options of payment by visa or Paypal
and will add a pdf application to be downloadable for offline payment.

and the second button is for Contributions from our NGO friends it will have 3 options of payment by visa or check or paypal.

i’m making a search in the plugins directory but without any progress please help me