Directly from the FAQ
How do I set a broker watch?
EQII ZAM has a notification system, designed to allow you to be notified if a given item appears on an EQII server for at or below a specified price. You can set a watch on the individual item pages. Select the server you wish to keep an eye on, select the price you wish to be notified for, and click the Set Watch button.
Where is the Set Watch button at?