Two options for do it yourself:
1) Easiest is find a 2 pin connector on something else (like the original fan) and cut it off leaving about an inch and a half of wire on the conenctor end to work with. Strip the rubber off the two wires for about 3/8 inch using your fingernail. These wires are too delicate to use sharp tools on. Cut the three pin connector off the new fan leaving about an inch and a half of wire so you can reuse it in the future. Strip the rubber off the black and red wires on the fan for about 3/8 inch. Leave the yellow wire insulated you won't be using it. Now twist the bare parts of the red wires together and twist the bare parts of the black wires together. Preferably solder them at this point or you can use very small wirenuts (solderless connectors) or crimp connectors. Now tape up the bare wire with electrical tape (scotch tape will work also). Then tape all three wires together to keep a neater package. It's done.
2) This is the ugly way if you don't have a 2 pin conneector. Not recommended for the inexperienced. You get some cutting /carving tools (file, sharp pocket knife, exacto knife etc) reshape the 3 pin connector. You basically cut off the end of the 3 pin connector with the yellow wire. Then file or shave off any keying features (fins, slots etc.) This is now a dangerous, universal connector. Dangerous because you can plug it in backwards. You need to know for sure which side of the conenctor on the video board should have the red and black wires attached.