Hi Siamack
Sorry to hear you’re having issues with the plugin. If you would like us to help you work through the issue by all means let us know and we’d be happy to help. I just took a look at the site (which looks great by the way) and I can’t see the issue on my end, so maybe you’ve already figured this out.
However if you have decided to uninstall then you can follow the steps here at this wordpress article: http://codex.wordpress.org/Managing_Plugins#Uninstalling_Plugins they describe it better then I could.
Please let us know if you would like to continue to use the plugin and we’ll do what we can to help!
Thanks
Neill