after looking at your site I must ask what theme you are using this is very irregular

Durlabh, try reinstalling your original theme.

Thanks for the help,It have been solved,but i may ask one question that is it possible to put a right side image in join page page so that it attracts more users,if yes please provide me with the code!!!please i have seen it in may oxwall sites.thanks,waiting for the answer......;D

Durlabh, unfortunately I am not a designer myself and can not give exact instruction on which code and where you should insert. But it is possible to put an image on the right side. Try finding a designer who will do this and other minor changes for you.