I want to modify custom contact fields called “USERNAME” and 'PASSWORD" in a campaign by using the Field Value snippet. But they do not show up in the drop down. How do I modify what the snippet will be able to show as an option?
You don’t. The snippet is restricted to what IS has given it access to. There are tools that can do it through an http post (plus this, api guys).
ok. API guys? Was there a link to them, it.
It was interesting that some of the fields that I can choose were fields that were not there originally but came from mailchimp when I assigned fields during a contact import.