Answer 1

You need to put it in the tab next to the task description. Then click Result.

Answer 2

Which error do you get?

Answer 3

Your code is incomplete. People are more likely to test your code if you LINK it so they can run it on the sololearn code playground.

Note that the numbers for the months start from 0, not from 1.

Answer 4

So what is the issue?

Your code is incomplete. The 1st line is missing.