Trouble finding how I can plug in this Molex connector from a Laptop Fan
Check the pitch and find something that matches on digikey (you might end up checking 20+ mechanical drawings, but thats the nature of these problems. Another option is to unsolder a connector from a laptop motherboard, just find a connector with the same pitch.

Third option, if the connectors aren't to small the 0.1" jumpers might fit into the end of that connector and into a breadboard. 

But it would be far easier to learn how to use a soldering iron, find a 4 wire connector that you can use, and splice the wires. Soldering irons can be found for as low as 10$.