Hi where did you find pics of the brakes for the model 15. Yes probably pads are worn.Looking at pictures of the model 15 the front looks like you just turn the adjusting screw at the end of the cable, if all the adjustment is taken up maybe the pads are too worn, can't see the back wheel. they have a dedicated forum which may help https://eriderbikes.com/forum/
Why not make is simpler and show pics of the brake calliper and the brake lever ?
Then we can see what you actually have on your model and not another one that may be different.