standard account

I recently tried to change the name of my administrator user account but this made the account turn into a standard one. Now I can't put in the administrator username and password when requested, which is a big problem when it comes to installing things. I have High Sierra (not sure if there is...

This is weird, has anyone else run into this? Finished up my ML installation, got past the setup screen, and noticed I couldn't run MultiBeast because of security settings. I went to go change the security settings to allow non-App Store apps to run, but it wouldn't take my login as an...