Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
Enter your account information
Please fill in your name and email address, and set a password. Enter the password a second time to make sure you typed it correctly. Click Create Account to proceed.
You will receive an email message with an activation URL. (If you already have an account, log in here.)