backup Mac to Time machine using USB
I am trying to set up my time machine to back up my MacBook Pro and iMac. I have to do it using USB cord because ATT setup doesn't allow for it. Can someone direct me to instructions on this? We were not able to get it done through the Apple Support though he was very diligent in trying to get it to work through the wireless
MacBook Pro (13-inch Mid 2009), OS X Yosemite (10.10.5)