I believe what you're asking is, how you put the new wiper arms in the correct spot after taking the old ones off? If that's it, I believe that you must put the wipers in a spot you will remember (like straight up, or down). Or mark it on the windshield with a bar of soap, and don't put the key in the ignition until you've got the new ones on and ready. I've never done it, so other input is appreciated.