so please tell me the "corect" way.
It is near impossible to describe this to you on the internet, but I will try my best.
First of all, you must start with the end of the polo on the inside of the leg, about 2 inches down from the knee. Wrap across the front of the leg, (never start in the direction that would require you to wrap across the back.) Maintaining even tension, continue down the leg. You want to dip slightly across the inside of the pastern, coming over across the back, and then pulling in an upward direction, to create an upside down "V" in the front of the leg. Continue wrapping at even tension, going up about a half polo-width per turn. Carry on to just under the knee, then wrap back down about 2 inches. The velcro on your bandage must be securely fastened across the front of the cannon. If it is in the back, or either side, it is creating pressure and is dangerously damaging the tendons of your horse.
If you cannot get your bandage to conform to these parameters, you are using the wrong size bandage. Most fleece can be easily cut if too long, but if too short, you need to buy new ones.
These are basic directions but please, if you love your horse, don't bandage unless someone with bandaging experience assists you a few times first. Trust me, polos applied incorrectly are doing more damage then your horse knocking against his own legs. If you're hell bent on protecting his legs and don't have lots of bandaging experience, stick with boots.
ETA: the polo on his left foreleg is wrapped in the wrong direction, pushing the superficial digital flexor tendon (which runs down the back of his leg) to the outside. This is MAJOR TENDON DAMAGE!!!!!!
Please don't ever do this, and, as long as he's not lame now, you'll be okay. However polos are full on skin contact and they don't give that tendon the opportunity to move when wrapped at the right consistency. This is a cause of bowed tendons.