You shouldn't... There's a security exploit and the person can get your administrator password.
Don't use MyTabs, it's full of errors!
is there any other way to get tabs for my forums?
http://mybbcentral.com
There's a plugin called Tabbed Menu and it's the best.
Unfortunately, subscription costs $10.
Or you can fix the security issue, instructions to be found at the end of the plugin's release thread