Steps in editing category
Step 1
Click on catalogue administrator
Step 2 
Click on categories
Step 3
Click on the desired category
Step 4
You will be sent to the category tree list, then click edit of the desired category
Step 5
Refill all the textboxes with new information about the category, Click update category once it's done
Step 6
You will be sent to the Category list, with the newly updated category