how do gain access to wp back office

HI

I have completely cocked up my site to put it bluntly...

I was trying to get the buddybar to show and I found a post on here recommending hiding the wp admin bar, hich worked but Now I cannot access the wp admin section. When I try to log in it just redirects back to the landing page. no-one can log in or sign up???

I have deleted the log in redirect plugin and theme my login as I thought that those plugins might be causing the redireciton but still no joy.

to top it off I am away in a hotel with just my ipad.....