It's not a stupid question, although it is repetitive as it has been mentioned before. The way to fix this is
1. Remove crown guard.
2. Unscrew caseback.
3. Loosen (
not remove) the screw that locks the stem in place. Probably just a quarter turn.
4. Remove the stem.
5. Insert the stem on a pin vise and lock the crown onto the stem (a little weak threadlocker, Loctit 243 is a common one, for some insurance can be applied).
6. Re-insert the stem into the case/movement.
7. Re-lock the screw in #3.
8. Screw in caseback and tighten it.
9. Re-attach the crownguard (again, some weak threadlocker on the screws for some insurance).
Finished!
Now if any of that sounds complicated to you, or you don't have the tools, or both, bring it to a rep-friendly watchmaker who will make short work of that procedure. Probably less than 10 minutes work if he's relaxing.
Now if you're thinking, why don't I just try to tighten the crown by turning the crown clockwise? That's hard and even dangerous to do. First off, at a certain point, when the spring inside is fully wound, you will feel some resistance when you wind it. One would think, well if I continue winding the crown it should tighten right? Well, it could, but also since the spring inside is already at its limit, tightening even further might break something inside, then you would have even bigger problems, and you would have to bring it to a watchmaker and you'd have to explain what happened and he'd look at you and tell you "You should have brought it to me when your only problem was the wobbly crown. It would take me less than 10 minutes, if I'm relaxing." :lol: