Transfer paid app from itunes to iphone?

I have a paid app on my mac which I downloaded from a different account whose password I don't know now. I want to transfer it to my iphone. How to do it?

Apps are associated with a particular ID. You will need to log into a device with the same ID to install the app. You can manage your ID and reset the password here…

https://appleid.apple.com/...apple.com/

When you connect your iPhone to your Mac through usb cable and open iTunes you will see your iPhone in the list of connected devices. Just drag and drop the app to your iPhone.
Or click on the iPhone link in the iTunes when you connect it and open the apps tab where you can install any apps and then click sync at the bottom right corner of the iTunes screen

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