It's a two-step process, usually, or almost always for me and most other modelers. You need to get some MicroSet to go with your MicroSol if you don't have any. First, dip your decal in water until it's "loose." Then transfer it to a paper towel (I'm telling you this the way I do it, which is not the only way, it's just my way). While the excess water is draining off, take an old paint brush and lay down some MicroSet, or other brand of setting solution. (I use those crappy white plastic paint brushes Testors includes with everything they sell. They're no good for painting, but good for dusting and applying decal set and solvent). The setting solution allows you to move your decal around until it is in the right position on the model, and gives it a good "base." After you are happy with that, apply the MicroSol (or other brand, and they range from pretty weak to the strength of decal-eating acid, so experiment. I use MicroSet and Sol except on really tough decals, but that lesson's for another day.). The solvent half of the two decal preparation liquids actually softens the decal and causes it to settle down into panel lines, and to go around or inside compound curves without wrinkling. Now, speaking of wrinkling, sometimes in the chemical process that goes on with decal solvents, the decal will wrinkle up on you. DO NOT PANIC, DO NOT TOUCH IT. Just go away. In the morning, you will see a lovely, flat decal on your model. I'm sure other people will have tips they might want to add. But the best thing you can do is, read the instructions on the bottle first. Good luck and welcome to the site, Jeff.
Tom