Enroll
/ɪnˈɹəʊl/
verb
To enter (a name, etc.) in a register, roll or list
To enlist (someone) or make (someone) a member of
“They were eager to enroll new recruits.”
To enlist oneself (in something) or become a member (of something)
“Have you enrolled in classes yet for this term?”
Synonyms: enlist, join, join up, sign up, subscribe, enlist, sign up, subscribe