Hello,

What plugins have you installed?
Do you have the required access to themes files?
Can you write your site credentials in a private reply, so I can check?

Best regards!

Hello,

I tried to activate Revolution slider (as it was one of the required plugins which was not active) and I got blank screen.

I checked it on debugging mode and I can see an Internal Server Error (error 500).

In these cases, a cause of this can be you don’t have sufficient memory, you should allocate more memory on your host.

Try to contact your hosting provider bout the issue.
Or I can give it a look if you can give me your ftp credentials. Let us know.

Best regards!