the registration page is not intended to be modified - and will change significantly in DotNetNuke 4.6.0, that allows additional registration providers. I suggest to use a custom Profile property and force the profile to be filled in for registration (see checkbox in  "User Settings"), this will show the profile form beneath the registration form.

any body can help us to mdify the alignment problem in the registration page,I used the direction right to left  in CSS,it's working on most of the modules (pages and container)

but still facing a problem : the label in arabic must be on the right of text .instead of ...the label on left

how to modify the design of the registration objects

thank you