Total N00B question - how doo I get these?
You need 8 Geekgold to buy one of these. Now that that's taken care of
you need to click on the Microbadge and on the site that takes you to click on 'Buy' on the right side (below 'Purchase this Microbadge').
After confirming that you want to buy it, it should take you to your account. If not, go to your account an click on 'Edit Microbadges'. Then just choose a slot and proudly display your new Microbadge.