If you’ve got a Shopify development store, you can add a custom app by going to Apps → Develop apps for your store → Create app, then using the “Install app” option once it’s set up. If it’s a public or custom app built elsewhere, just use the install link provided. I’ve worked with PixelCrayons before for Shopify development, and they made this process super smooth. They handled everything from app setup to testing on the dev store. Definitely worth it if you don’t want to deal with all the technical steps yourself.