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Play -> Multiplayer -> New -> Ok -> Altis -> One Kill One Shot [SP/COOP 3] -> Play.
This should land you in a multiplayer lobby, hosting the mission and waiting for your friend to join.
Make sure to host it on "Internet" as opposed to "LAN" if your friend's not on your LAN.
Hope that doesn't under/over–explain it. Have fun.
But most of the time it's ok. :)
Kills: 52
Score: 991,000
Highest Streak: 16
Accuracy: 78%
Also, please report any bugs, glitches, or feedback in the "Report Bugs/Feedback" discussion.