Cannot Login

Version : Elgg 1.8

Hi folks, 

I've been working on an Elgg site (which I'm totally new to - and in no way a developer) and in playing with the custom_index_widgets plugin I have "killed" the site.

I logged out, and now have no way to log back in to do anything or change any admin settings.

Is there a login URL I can use to access the login function?

Thank you for any help/direction you can give me,

Baz