customise windows login dialog box for EP portal/Sharepoint 2013

Hi ,

I have an EP portal . (2012 R2 contoso machine new)

I  created a custom login page for EP 2012 R2(using steps  used for sharepoint 2013.)

then Once I login into EP, because such branded custom login pages are possible  by FBA authentication only.

so, Can I see the EP content , role center as like normal user, or Can't see ?, because I am an FBa user.

Any suggestion or Idea required.

regards/-