wp-admin login page down

I have 2 wordpress installation on a domain. ie. domain.com and domain.com/wp2/

So i changed my “site page” on domain.com/wp2/ -> domain.com/login
I am referring to the feature where you can change the login page to a given spoofed directory and page.

I can now not log into my wordpress admin console for domain.com/wp2/
I am getting page not found error 500.

Any help trying to get plugin deactivated or changing this setting through other means, such as manually in the code. If in the code, where can I find the code that puts this setting into play on my site.
Thank a million

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