Don't worry the categories are there. They just won't show up until there is a post in the caertogy.The other possibility is that you don't have the categories widget in your sidebar. You can go to Appearance / Widgets and drag the categories widget to your sidebar.
Top Categories
Recent changes
MattisManzel • 1 day ago
Prem789 • 1 month ago
185.164.157.47 • 2 months ago
Peterhun14007 • 3 months ago