Yes! You can add a new Membership Card to your account at any time.

For example, let's say you purchased a 6 month Membership Card, but still have 1 month left on your current membership. You can add the 6 Membership Card to your account at anytime and you'll get the full time you've paid for!

This means you can even purchase two 6 month Membership Cards and activate them at the same time to enjoy a full year of membership.