When you create your ORCID record, it is possible to add multiple e-mail addresses to the account. This might be a good idea if you have multiple e-mail addresses that you have published work under. You can only add e-mail addresses that you control.
To add an e-mail address to ORCID, log in at orcid.org and look for the e-mail listing in the left sidebar of your own ORCID record and click the pencil to edit. It looks like this:
When you edit, you have the option to enter a new e-mail address. You will need to click a verification e-mail to ensure that you are the owner of that address. You can also change the primary e-mail address associated with ORCID if you wish. You can also set whether everyone can see that address (green option), just trusted parties (yellow key), or just you (red lock). Here is what that looks like: