Hi Candela1970,
It's great to learn you're new to QuickBooks! Welcome to the family. The program is designed to help you get ahead with your accounting and I'll be glad to point you in the right direction with changing the information on your categories.
To make sure we're both on the same page, are you looking to edit the expense category? If so, what happens wen you open the expense in question and try to make adjustments that'll shows the correct info?