How exactly do I run the -rescan command for bitcoin-qt from console on a Mac? I downloaded the blockchain from a torrent, but when I imported my old wallet.dat file, the balance is not showing.  I am unfamiliar with console operation, so please be as specific as possible.  Thank You!
Method 1

Open "Finder".

Press Cmd + Shift + G

Paste this:

~/Library/Application Support/Bitcoin


Edit bitcoin.conf with TextEdit

Add this line:

rescan=1


Save it, then run Bitcoin-qt.

After you the rescan ends and you quit don't forget to revert the bitcoin.conf

Method 2

Right click Bitcoin-qt

Choose "Show package contents"

Go to  Contents/MacOS/Bitcoin-Qt

Run Terminal.

Drag the file to terminal

Type -rescan

Press Enter.

Don't quit Terminal before the rescan ends and you quit Bitcoin-qt

It's done.