DillyBarBoy The guide is meant for people who don't necessarily know their way around computers. Most of it makes perfect sense if you folllow the instructions: you'll see the same thing on your screen that's in the guide screenshots, and then you'll know what to do next. If there's a particular step that's giving you trouble, let me know. But I can't rewrite the entire guide based on my predictions of which steps you might be getting stuck on.
As for the location where Sims 4 is installed, I already described where to see it. Please open the EA App and have a look.