pagination doesn’t appear on templates, PayPal images don’t appear on pages

Hello,

Two issues:
No pagination despite adding the correct tag (I think) here:
https://www.meria.net/ (bottom of posts list)

I tried adding PayPal buttons here:
https://www.meria.net/donate/ and the page editor makes them disappear, although the do work just fine on the sidebar (template) here: https://www.meria.net/

Any assistance is gratefully appreciated.