Register Page Not working (or deleted?)

Hello guys,

First of all I’m new to wordpress and can’t code yet so I use plugins and themes. I’m having trouble after deleting the Ultimate member plugin because now I can’t register users at all (it used to work before). I now just want to add members with the regular form and that page does not exist I think… How can I make the users register without using any plugins? (user registration is enabled in Settings > General). I just want the normal registration to work and can’t seem to make it work. I have to make a “registering” page or something? How can I do that without plugins or with an easy,free and BP compatible plugin?

Thank you in advance

WP version is 5.3.2

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