I have Pardot Advanced, enabled Send Time Optimization last week, and have been reviewing the Pardot Einstein Features Implementation Guide. However, nowhere am I finding the STO to add to an Engagement Program or Email Template Drafts. Do I have to manually set up an individual email to track it? #Pardot #Pardot Email #Einstein Send Time Optimization
Tom Bassett (Vera Solutions) 
Forum Ambassador
The Email Content is a new(ish) object as far as I am aware.
"EmailContent is only available for orgs that use Pardot. The Manage Email Content user permission is required. Users also need the CRM User, Sales, or Service User permission set. EmailContent isn’t available for custom portal or guest users."
Once you have the necessary permissions you should be able to access.
I'm pretty sure the send time optimization is only from that tab and not the Pardot email builder
