You will need a token to create repositories or commit changes.

Treat tokens like passwords!

1. Navigate to https://github.com/settings/tokens/new.
2. Put name that clearly explains why you need this token.
3. Select public_repo scope, depending which repos you want to edit from here.
4. Click generate token, copy it, and paste it in the MakeCode dialog.

For private repositories, select the repo scope.