Hi?
I have a site that is a showbiz site so people comment using Disqus and recently i installed MJ plugin,i would like to hide this commenting system or stop it from loading to mobile users.
Anybody can help me.

If the Disqus is reached as a menu option, then this post which describes how to have a separate menu just for mobile users may be of help.
www.mobilejoomla.com/forum/topic.html?id=428#p1756
Alternatively,
To prevent the Disqus plugin working when a mobile browser is detected then the following post may be helpful.
It requires adding code to plugins / content / jw_disqus.php (similar to check if plugin is enabled)
www.mobilejoomla.com/forum/topic.html?id=378