The easiest way is to use Auto-Fill. Select the Add Points tool. Now look on the Tool Options Bar and locate a box that says Auto-Fill. Click the box to activate it. You should get shapes easily now.
What you were probably doing wrong is you were
neglecting to tap the Spacebar after you clicked Create Shape.
Here are the steps to drawing a colored blob shape:
1. click the Add Points tool
2. draw a blob
3. click the Create Shape tool (now there are checkers)
4. press Spacebar (now there are colored checkers)
5. press Enter (ta-dah!)
6. click Help on the Menu Bar
7. click Online Tutorials
8. total mastery!
