Well first you need all your images. If you don't, go to the graphics section and find some.
Now when you found them, go to your admin panel --> users and groups --> users --> profiles --> create new --> list of images --> add images and text --> save
admin panel > users and groups > profiles > press that green + to add a new profile field > in that drop down menu choose "a bar" > name it warning level or anything you want" > obligatory "no" > display type "icon and text" > who can modify: either check none of them or check moderators if you want them to be able to change warning level > display this field for users that are at least "members" at the bottom you can decide how your bar looks like and how many levels there exist > save!