Hello Dawoodshaik,
Sorry you're having problems with OpenCart thumbnails. There many possible problems for this issue, but we do need more information (version of OpenCart, account info -if you're an InMotion customer, error messages). Check this post to make sure that your problem has not already been discussed and resolved through OpenCart's community.
If you have any further questions or comments, please let us know.
Regards,
Arnel C.
To access cPanel, you can either log in through a link within AMP, or you can get directly to the URL. The following article will walk you through various ways of accessing cPanel.
cPanel Login
If you are unsure of your password, you might need to reset it which you can do through AMP as well:
Resetting your cPanel password using AMP
If you are still having trouble when using the correct username and password, you might need to contact support via chat, phone, or email to make sure everything is well with your account.