Hello Wendy,
Other than taking the dress to a local drycleaner and have the pleats pressed the best at home way we've used to properly iron pleats are as follows.
Follow these tips to iron pleats with ease:
1) Turn on your iron and set it to the appropriate setting for your fabric type.
2) Have your iron's sprayer filled or a spray bottle of water handy if needed to use during ironing.
3) Fold and/or arrange the pleats the way they are supposed to appear. As you hold them in place, you must iron over the arranged pleats beginning at the top of the pleat and working your way downward. For stubborn fabric, it may be necessary to pin the pleats in place. However, do not iron over the pins. Pull them out one at a time as you iron. Remember to iron in a top-to-bottom manner.
4) Another way to get a crisp finish is to separate the pleats and run the iron up the material hidden by the pleats. The pointy side of the iron should get up into the intersection of fabric that forms a V due to the pleat stitch. Then arrange the pleats they are supposed to appear and go through Step 3, so you can emphasize the intentional folds in the pleats with the iron.
5) When you are done ironing pleats, hang the item from its top to keep the pleats hanging straight.

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