A couple beginner questions about registration and login

Getting advice
1

I’m very new to Keycloak and IDP in general, but I’ve been asked to set up a simple SSO process for a couple small applications to share. I have a couple questions I haven’t been able to find clear answers on -

  1. After I’ve enabled user registration, how can I find the links to the login and registration pages?
  2. How can I restrict the range of usernames to a combination of words from a predetermined dictionary? Do I have to create my own registration appilcation and use the REST API for this process?

Thank you!