How do I enter existing members into the membership premium plugin, with different expiration dates

I am setting up a new installation of Buddypress using Membership Premium Plus to add the members. These initial members have a start date and an expiration date. I do not see a way to include this information as I'm typing in existing members on this initial set up. In fact, I don't see a start date at all. Something that we need to keep in our records. Am I missing this data field?

How can I change the expiration date? Manually within the database itself?