The great thing about GameSalad is you aren't limited to one platform, and you certainly don't have to change any settings between platforms.
Now that you have completed the development of your game, you want to publish it. Of course, with mobile platforms, you will need to be signed up as a developer. If you want to publish your title, simply click on the Publish button on the top bar of GameSalad, as shown in the following screenshot:
When you click on this button, GameSalad will prepare your project and upload it to their servers. The great thing about this is they store your project each time you publish it. So, if you have a mishap and you lose a bunch of data, you can go back and download the latest published project.
After the upload is completed, you will be brought to GameSalad's website, and once you log in, you will be prompted to create a new project, or update an existing game:
If this is your first time uploading your project, click on Publish as New Game...