Odd question - how do I change categories

I've used the Portal before and never figured out how to do this. When you first start up the portal, it asks you to enter categories, so you can run a multi-item shop and still keep everything seperate. That's fine, but how do I switch categories when entering items? I'm using the newest core version of the Portal.

Go to settings on the main page and uncheck default. Then when you load up the portal you can chose what profile to use or you can create one.