When you are inside Premiere Pro or After Effects and you have selected your team (if you have more than one):
Click the ‘Add a folder’ button at the bottom of the panel on the folder view screen.
Give your folder a name.
Click 'Save'.
Boom! You have a new folder.
Note: Your folder structure inside the Panel is synced precisely to your folder structure inside Wipster. Creating a folder in one will mean you are also creating a folder in the other.