I am fairly decent when it comes to creating scenarios, I went through it, made a few personal maps and all, but there is one question I couldnt find the answer to, how do I change units names?

Okay, firstly, hello to the forum. Secondly, I have seen Panzer Corps a few weeks played by a Youtuber and have decided to get it. I have finished the base game campaign with Germany, but the expansions are darkened and I cannot access them. It says that they are not installed and asked me to purcha...