How to Set Password on Octoprint

When I first set up octoprint I didn't set a password and now I would like to set one for it. Only I can't find a setting to do so (I might just be a noob and have missed it), so does anyone know how to set a password so that only I can access octoprint? I have the latest octopi version and have the raspberry pi 2 B with the Monoprice select mini v2.

Please have a look at this topic.