@garcial743 Press Garage and then a in game tab will pop up and ask you to stay in battle while going into garage mode or not. Press Yes to stay in the game and No to not stay in the game. After that, wait for it to load, then you are ready to change equipment. After you have finished click the "X" or the arrow button to return to the game, your tank will auto self destruct and your new equipment will be there.
ProTip: Eat Fireflies before you eat anything else, if you leave one or two or more lying around, there's going to be a moth mayhem and about 20 will show up in 5 seconds and will immeadiety wreck your web.
Try to save your .png file in another image editor. For example, you can use Paint.net and save the images as 32 bit PNG.