they do not need to be defined first, you can simply type the name on the position field when you create the module.
you are doing this in a backend module? it is set to show on all pages?

It is in a backend module and it shows on all pages.
I am placing module in contentstats_backend_1 position. The module does not show in Control Panel page. It will show if placed in cpanel position.

contentstats_backend_1 it's not on the control panel page, it's on the content statistics component page.

Thanks, I got that wrong then...

Hi, I got a big problem with this.
I created a backend module and I put contentstats_backend_1 and contentstats_backend_2 position, but they don't work. Then I put a position of my administration template (Isis), I think cpanel or other, and now I can't access for administration. I got a blank page and It doesn't work
Please, I need help.

I have send you an email.
In it I have put url but It isn't possible access to login, page is blank.
It occurs after I put cpanel position of my administrator template to backend module of content statistics.