Go to the Finder - click anywhere on your Mac's desktop, and choose File > New Folder.
If a folder appears on your Desktop then you can ignore the reference to the house icon.
Continue from where he wrote "open the Terminal in the /Applications/Utilities/ folder "
You can find Terminal by using the Finder's Go menu and choosing Utilities, then double-click the Terminal icon.
In the Terminal window, you will do something like this
Last login: Wed Feb 12 03:21:53 on ttys000
Johns-iMac:~ john$ mkdir ~/.Trash
mkdir: /Users/john/.Trash: File exists
Johns-iMac:~ john$ sudo chown $UID ~/.Trash
Password: (type your password then press Return)
Johns-iMac:~ john$ chmod u+rwx ~/.Trash
You will be typing the entries in red exactly as shown. Press the Return key at the end of each line.
Drag the folder you just created to the Trash and confirm that it appears in the Trash.
Empty the Trash.