Move existing passwords (etc) into Categories (ex Lastpass)

Categories are fixed. They are the template names your items were created from, and they cannot be changed afterwards. If you want to group/organize your items, use tags instead. Edit an item, at the bottom you find the option to add tags. You can also drag an item or multiple selected items to some tag displayed in the sidebar. Tags will show up in the sidebar as soon as you create at least one item with that tag.