Stolen/ lost iPhone, can I add a tracker app remotely to my phone from my computer?

How would I ad the app ''lookout'' to track my phone without having the phone here? There's a guy on YouTube that said he can do that but i don't know how to remotely ad an app without the phone being here

Well, you can download the app from the app store on iTunes from your computer. I just downloaded an app from my computer to my iPad & my iPad is all the way an hour away. You just have to make sure they don't see it and uninstall it from your phone. I don't know what you do for that because I have an Android and they have specific apps for if you lose your phone without having something already installed in it. & I went to the computer online play store & downloaded it to my phone when mine got stolen. I got it back a few days.

Is that app specifically for that? If so, just download it from iTunes on your computer and it will automatically go to your phone where you can do whatever you need to do for it to track it down. I wish you luck and hope you get it back! Have a good night.