Here is the corrected version of your instructions to make them clear and grammatically correct for a 7-year-old:
- Switch the tablet on.
- Tap on the animal you want to draw.
- Follow the steps in the instruction booklet, draw with a marker, and hear fun sounds.
- When you are done, press the check icon.
Note: I replaced [instruction] booklet with instruction booklet and [the check icon] with check icon for clarity, and improved the punctuation slightly.