First, sign up for the UPS Buy More Get More membership here:
http://theupsstore.ca/small-business-solutions/get-more

You'll get an email with your BMGM number right away...write it down (card gets delivered in about 4-6 weeks, or longer!). If you're doing this for multiple accounts, use Google Chrome's Incognito mode, so that it doesn't cache your BMGM info, preventing you from signing up for a 2nd BMGM account. Or, clear your cookies/cache or use a different browser.

Bring the new BMGM number with you to the UPS store, along with your Aero number. Look for things that are at least $1 (minimum). I have bought things such as envelops, Exacto Knives, glue sticks, pens, etc....but each store has different stock and different prices. You'll have to see what's available at your UPS store.

I have used this promo for all 7 of the accounts that I have to maintain for my family, 651 points each time. The UPS clerk will log into their system, punch in the BMGM number, your first/last name, and then ask for your Aero number (so, I guess the names must match??). They will tell you RIGHT on the spot that you got 150 + 500 points. I just did two of these yesterday morning, at 10am. When I checked my AP.com accounts, at 10:30am, they points were ALREADY posted online...super fast postings!

BTW, you can't churn this with multiple BMGM accounts on the same Aero account.