S.F.T.R > Trick Tips >Heelflip
This is the most basic trick and you need to know it before you can attempt any other trick, it's pretty easy once you get the hang of it and then you can practice doing real cool stuff like kickflips.
1) Place your feet in the ollie position, make sure 1/4 of your back foot is hanging of the edge.
2) Pop the board as you would for an ollie but this time slide the ball of your front off the left of your board (if in normal stance).
3) You might have to bend your knees more for this trick, just like the kickflip be above the board at all times.
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Bonus Tips:
If you find that your board spins too slow (or doesn't spin at all) it might be because you're not pushing down with the ball of your front foot or you're not pushing off hard enough.
Practice practice practice!