I have the cable...Now How do I pass programs from TI 83+ to other TI 83+?

The sender should:

1) Press [2nd][X,T,θ,n](Link)

2) Select the things he wants to transfer (selected ones will have a square dot next to its name)

3) Move over to the Transmit submenu and select 1:Transmit.

Meanwhile, the receiver should:

1) Press [2nd][X,T,θ,n](Link)

2) Move over to the Receive submenu

3) Select 1:Receive.

Transmitting and receiving should happen roughly at the same time. If all goes well, the transfer should be successful. If not, check the cable connection and/or try to resend again.