Don't feel bad... you'd be suprised how many old veterans out there still don't know how to put their bike on the centerstand properly.
Stand on the left side next to your bike.
Put your left hand on the left handlebar grip.
Put your right hand under the rear grab rail, or under the rear seat/tail section somewhere relatively solid.
Put your right foot on the centerstand lever/pedal and push it down to the ground.
Make sure the bike is balanced so that both feet on the centerstand are touching the ground.
Now, in one smooth movement, step down with most of your weight on the centerstand lever/pedal, at the same time lifting up on the rear with your right hand. Use your left hand on the bars to keep the bike steady and straight.
Should pop right up on there no problem at all.