"send the test out, choose the email you added the test to in the send email flow step of your trigger campaign. You also have the option of inserting that email into a stream of an engagement program".
Well, by that email, they mean the email to which the test is added and approved, i.e., the champion email. Once the test is added and approved, you can use the champion email in your trigger email's Send Email flow step or add it to the engagement program's stream as content. This should be sufficient for the test to be set in motion, i.e., send the champion and challenger emails per the set distribution.
Also, it may be a silly question but, for the test to run do i have to turn on my nurture program?
Thank you so much for you help.
Yes, you need to have the Engagement (Nurture) program turned on for it to send emails to members. Turning the Engagement program off will stop any content from being sent out.