Hi!  Where can we find the date of our membership expiration date?

One way is to go to "My Account" -> receipts  (to the far left on the gold bar).
Start with the most likely date .  At worst you only need to look through the receipts from the past year until you find one listing "annual membership" as an item ($20 for a full membership).

Another way is to go to your profile, your membership type should show as a clickable link.
Click on it, the site will bring up a page describing the three membership levels, and indicating one as "This is your current plan" with an "Extend Subscription" button.
Click the "Extend Subscription" button.  This will bring up a page that indicates the date your membership expires and give an option to buy an extention for another year.

Click on the little clock image before the word 'credits' at the top of any page. Touch lightly for the date or press for more info plus the date.