How do I get past the finger?

Hint 1 of 4:

The finger is attached to a head that looks pretty bored.

Hint 2 of 4:

You should try cheering it up.

Hint 3 of 4:

Have you read the witchcraft book yet?

Hint 4 of 4:

It makes people laugh.  Perhaps you can get the face in a good mood.