Cannot Approve or Edit entries

I am no longer able to use the “approve” functionality or even edit entries to be able to have them displayed on the front end at the page above. When I click on the edit link in the WP backend, I get a not found error. The URL looks to be screwed up: https://affordablebaysolutions.org/wp-admin/undefined&screen_mode=edit

I’m guessing the “undefined” part of the URL should be the post type or something?

Any help would be greatly appreciated.

The page I need help with: [log in to see the link]