once a workflow is set for 'send email' how ...

[L_T]

once a workflow is set for ‘send email’

how can we alter email addresses??

[Phil]

There are several ways to specify the email addresses of the workflow email recipients. See topic “Send to” in this article help.appsheet.com - Sending Email from a Workflow Rule or Scheduled Report

If that does not answer your question, can you explain what you are trying to achieve in more detail? Sending Email from a Workflow Rule or Scheduled Report help.appsheet.com