Membership: import csv users and change expiration date

I really like how easy Membership is to use. I have a couple of questions:

1) How do I import users from another site using csv file? What type of information do I have to have to do this import successfully? I have a drupal site and can extract any information from the database, but I don't know if Membership allows me to do such an import.

2) This may seem like a simple question, but I can't find the place to change a member's expiration date. Should be a simple task, but I cannot find it without accessing the database directly.