Any number of additional credit/debit card profiles can be added through your bank’s online site.  Typically you will need to log in to your bank web site, and verify your identity by answering several security questions from your bank.

If your PocketKey was provided directly from your bank, there may be restrictions on adding card profiles from other banks.  For example, you may be able to add the profiles, but will not be able to set them as the default profile.