Once you have the first service selected, not forgetting to provide the link (!), just click "Add To Cart". Then navigate to another page, or add a different link to that same service, and click "Add To Cart" again. Repeat the process as many times as you want. You will then have a cart full of services to check out. When you are ready, click the shopping cart icon on the top right...you will see the list of services you are looking to buy....then click CHECKOUT at the bottom. All done!