If you have more than one account on MyRegistry.com and are using the same computer to manage those accounts, you still will only need one Add to MyRegistry button. You’ll have to enter gifts into each registry separately. Once you click the button, make sure you're logged into the account you wish to add gifts to. On the top of the +Add Gift panel that opens up, you'll see the name of the account holder. If you wish to add gifts to a different account than the name you see, simply click on the Not you? Click Here link. You'll then be prompted to login to the correct account, after which you can easily add gifts to the proper registry.

However, if you have more than one Gift List under the same email address, On the top of the +Add Gift panel that opens up, you'll see a drop-down menu "Add this to" where you select a different Gift List to add the item.