403 Forbidden Errors

I am new to CWP. I have added a sub-domain and then installed WordPress. I go to the admin and login and then I get a 403 forbidden error. Cant figure out why its working fine until I try to login and then 403. Even when I empty the directory and try to start again or just have the directory empty I am getting a 403 error, so I presume its related to security or apache but I am not super technical. Thanks for your help in advance.

check apache log probably mod security module is blocking the page

And that is what a super unhelpful reply looks like. That was the only post by "andrewau". I wonder if they took the super vague response and fixed their issue and never had another problem, or if they just gave up on CPW forever.