1. Go to Add Products step in the team store.
2. Click Add Products to Customize.
3. Scroll down the page to view the products you can add. Select a product you want to customize
4. You can continue selecting other products you want to customize
5. You can browse through Categories or Brands on the left to find the product you want to customize
6. Scroll up to the top of the page and click View Selected Products to see all the products you've selected
7. Once you're done, click Customize
8. Your selected products will now be available in your Custom Design Tool