You no longer have access to the admin

I was editing the site on wordpress, when I entered the plugins area the site stopped and loaded the wordpress installation page, I can’t access the admin page anymore

Open the File Manager and navigate to /wp-content/plugins/, then delete the folder for whichever plugin you installed last (or all of them, if you don’t know which one that is). Wait a bit, clear your browser cache, and you should be able to get back into your site.