Crafting needs to be unlocked by:

1. Click the “Get Wood” button enough to get at least 10 wood
2. Click the “Make Planks” button to turn 10 wood into 1 planks
3. Repeat steps 1 and 2 until you have 4 planks and the “Make Crafting Table” button appears
4. Click the “Make Crafting Table” button
5. Click the “Crafting” button to show the table
6. Put in your materials in the correct positions and click the “Craft It” button

Note that each square of the crafting table requires 10 of a resource. For most crafting, you will only get a single item back. However, just putting in wood and clicking “Craft It” will give 10 planks, and making sticks will give 4.

I’d definitely recommend making an axe and pickaxe before anything else. As you make more, you’ll unlock other features.