You will be on the Refs page once you have logged into Mathjobs.Org. The actions available to you are presented as *links* across the top of the page. If you are unfamiliar with what you can do, please first read the information on getting started as a MathJobs reference letter writer.
Click on the corresponding links below for the detailed documentation on your available options.
Refs .. is where you create, submit, or update your reference letters for an applicant
Jobs ..allows you to view the department's current job list