Looks good. I can only think of a few things to change and their so minor I'm only mentioning them so that my post here has value.
1. When you create an account, you might want to pop up a message box saying that the account was created successfully or something. It seemed weird that when I clicked OK I was immediatly brought back to the main screen without any sort of confirmation.
2. After I log in, on the welcome screen, you display my information in Text Boxes. Although I'm not allowed to edit them. That's fine, but you could also display this info in labels and change the "BorderStyle" property to 1. This will make the label look like a text box, but you won't be able to place your mouse cursor inside giving the impression that you might be able to change it.
3. I saw that somebody complained about the colors on the forms. Personally I like a little color but then again I'm forced to stare at gray 9 hours a day. You might want to add a common control dialog that allows the end user to change the color to fit their personal tastes.
4. Have you played with MDI forms yet? If you wanted, you could make this program an MDI and allow the user to view both their level up days and B/P days at the same time.
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Like I said... none of that is important. In fact it's so minor I had to dig for something to mention. None of those break or effect the program in any way, just things to play with if you get bored. Besides me being picky, it looks great. :)