Sign Up to Something, E.g. a Youtube Channel
Puzzle 13 of Pop Bands Pack
Question is: Sign Up to Something, E.g. a Youtube Channel
and the answer is: SUBSCRIBE
Word Meaning:
SUBSCRIBE — (archaic outside law) To write (one’s name) at the bottom of a document; to sign (one's name).
Definition source: Wiktionary (CC BY-SA 4.0)