how do i set reminders
I've read about a feature for setting reminders on certain emails in macmail - by either swiping right on the the email, or right clicking. But this is not showing up for me.
MacBook Pro 13″, macOS 10.12
I don't know about Reminders, which I don't use, but when Mail detects something like a date and time, you should be able to add an event to your Calendar. This is in fact a feature that is several years old, called "data detectors".
Whem you hover over that information in the e-mail, a little downpointing arrow appears.
Click it and an event opens, ready for editing and, if you so choose, adding to Calendar.