When someone asks you to access a folder or file on your mac within the logged in
Users/<username> folder
you will see the ~ (tilde) symbol used, this tells the mac to go to the Users/<username> directory.
For example if I wanted you to navigate to the com.apple.finder.plist file I would ask you
to click once on the Desktop, click Go in the menubar select Go To Folder and enter this text.
~/Library/Preferences/com.apple.finder.plist
press Go
A new Finder window will open with com.apple.finder.plist highlighted.
The mac has been asked to go to the file com.apple.finder.plist which is
contained in the path Users/<username>/Library/Preferences.
The ~ symbol tells the mac to search the logged in users directory.
if you have other users on your mac and want to locate files on their account from your
account you would have to enter the text as
Users/<useraccountname>/Library/Preferences/com.apple.finder.plist