"Right Click" on the image and choose "Save as"
Panathinaikos Home kit 2016-17
Panathinaikos Away kit 2016-17
Panathinaikos GK kit 2016-17
HOW TO INSTALL
Step One: Load up PES 2017 and go to Edit mode. From there, select import images, and copy the kits from the USB.
Step Two: Following that, enter the 'teams' section of Edit mode, choose a team, and select 'strip'. From there you'll be presented with home, away, and keeper kits. Pressing Square enables you to add a third kit.
Step Three: Find the kit you want to change, select it, and then choose the 'paste image' option. Navigate through your imported kits until you find the corresponding strip, and that's that.