1
general::
Phrase(s): register someone for something
to sign someone up to participate in something. • Would you please register me for the workshop when you sign up? • Excuse me. I have to go register myself for the contest., Phrase(s): register for something
to sign up to participate in something. • Have you registered for the class yet? • She is registered for the same classes as I am.
McGrawhill's American Idioms And Phrasal Verbs