Actualy you know what i think i can get this from memory, go to your COM pannel, and at the right of the FMC in the center it has your sqawk code thats origionaly set at 1200, well above that has a switch that says above at the top, N in the center and Below at the bottom, set that at above for your climb or what not and it will show planes above you and their altitude. Next go to the switch to the right of that and make sure the switch goes up i cant remember what exactly it says but do it anyways haha, then below those two switches it has the knob pointed at standby test or something like that, switch it all the way to the right till it says TARA or something like that. Then go to your 2d pannel or VC
and above the ARPT button to the left of your FD
switch it will show you a knob that says TFC, click that and it then should display the traffic around you that is in the air and if you get too close to a aircraft it will tell you to climb or descend with the automated voice, also it will say traffic and brings you to the attention of where the airplane is in comparison to your A/C. I hope i remember it right and tell me if it works. I remember you can do that with all 737s they have as well as the 744 and 744F. Hope this helps!
Oh and yea the above, n, and below are to display aircraft above you, infront of you i believe, and then below is the aircraft below you, the above and below display infront of you as well so dont worry it will remind you.
We dont worry about small things like that...