I am needing to insert the action Start a Workflow. However, I am confused by what information I am to enter in the Username and Password fields. Is the Username something I get from the SharePoint administrator or is it my work login? Is the password one I make up or is it the one associated with my work login username? If I use my work credentials, what happens when I am instructed to change my password? I am using Nintex O365.
Thanks for your guidance.
you need to provide a credential with permission to start the workflow. Basically this will be the initiator of the workflow.
It could be your credentials / your work login for testing purposes, but it's better to use some service account provided by your administrator as the workflow will crash once you change your password.