Edit Page Not Loading

I updated to 5.8 a few days (?) ago. We don’t often have to edit pages, but we’re preparing for the new school year and we needed to update the registration page (https://arcoirisbcc.com/registration/). Usually, I go to PAGES and then click on EDIT to load the page for changing links and verbiage. However, this time, the edit link takes me to a blank page. The header of the window says “EDIT PAGE…” but nothing loads.

I have updated all the plugins and SSL and other items requested by WordPress in the Dashboard. I have tried this in both updated Firefox and Chrome browsers.

Be aware: I AM NOT CODE SAVVY.

Hope someone can help me out here…

-Dan

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