You have the option to add multiple registries to your Enter Details page. Whichever registry is most recently added will be the first registry shown to guests. If you prefer your registries to be shown to guests in alphabetical order, you will want to start with Z and end with A when adding registries.
For example, If you have a registry at Amazon, Crate and Barrel, and Target and want your registries shown in that order, you will want to add Target first and add Amazon last:
Enter Details Page: