prblem with sudomain

Hi, I have a problem with one of my sub domains, tradewindbounty.com It is a subdomain of my primary domain americantrailboss.com, that I have with wordpress.
On the website tradewindbounty.com I installed a plugin for forced SSL on the site because some of the plugins on the site were coming up unsecured even with my SSL certificate authentication that I bought from godaddy for multiple sites. when I activated the plugin it changed my site address to https from http like I wanted but now the page and my dashboard, nor any part of my site comes up. just a page that says it cant be loaded. This is my Ecommerce site and it being down I am loosing money. PLEASE HELP
I have tried every way possible even thru wordpress login and I am totaly locked out because of this plugin. Please help me fix this…where I can get in and delete the plugin, because at this point I cant even do that…Thank you so much for your help, Don Gianino