Changing Icons on Mac

[Jnardis]

Can some one please post step by step instructions on how to change an icon from normal to retina for the ip4? Also does anyone have retina icons for the phone and citibank? I'm using a Mac. Txs

 

[iPhone-power]

Likely no one is responding to this because these instructions already exist in several current threads here.
If I wanted to learn this, I might do some browsing.

 

[Jnardis]

I read everything online and it mentions to change the icon to 114X114, but I don't see anywhere to do this on the mac when i open the icon.