Sims 3 on Macbook Air installation

I installed the sims 3 and every expansion/stuff packs i have on my macbook air. When i tried to play it, a pop up message says 'unknown error occured' so i uninstalled everything and tried to break it down one by one to see if i can even just play with the sims 3 alone. when i tried, the launcher opens but nothing happens when i actually click play.. i found this online and tried to follow it:

1. Open Macintosh HD 
2. Open the Users folder 
3. Open your home folder (it'll be named whatever your username is) 
4. Open the Library folder 
5. Open Preferences 
6. Once in that Preferences folder you will want to move "The Sims 3 Preferences" as well as any "com.transgaming" and "ipatcher" files you find to the trash. 
7. Empty your trash

but i dont have a library in my home folder? i am new to mac so please give me a step by step solution..