Here's how to make a double crochet stitch:

1. Yarn over your hook. This means you wrap the yarn around your hook from back to front.

2. Insert your hook into the designated stitch. If you're working in rows, this is typically the fourth chain from the hook (to account for the turning chain). If you're working in the round, you'll insert your hook into the first stitch.

3. Yarn over again.

4. Pull up a loop through the stitch. You should now have three loops on your hook.

5. Yarn over once more.

6. Pull through the first two loops on your hook. You should have two loops remaining.

7. Yarn over again.

8. Pull through the last two loops on your hook to complete the double crochet.

   You've successfully created a double crochet stitch.