Once you have logged in, you can customise various aspects of Bugzilla via the "Edit prefs" link in the page footer. The preferences are split into four tabs:
On this tab, you can change your basic account information, including your password, email address and real name. For security reasons, in order to change anything on this page you must type your current password into the "Password" field at the top of the page. If you attempt to change your email address, a confirmation email is sent to both the old and new addresses, with a link to use to confirm the change. This helps to prevent account hijacking.
On this tab you can reduce or increase the amount of email sent you from Bugzilla, opting in our out depending on your relationship to the bug and the change that was made to it. (Note that you can also do client-side filtering using the X-Bugzilla-Reason header which Bugzilla adds to all bugmail.)
By entering user email names, delineated by commas, into the "Users to watch" text entry box you can receive a copy of all the bugmail of other users (security settings permitting.) This powerful functionality enables seamless transitions as developers change projects or users go on holiday.
The ability to watch other users may not be available in all Bugzilla installations. If you can't see it, ask your administrator.
On the Search page, you can store queries in Bugzilla, so if you regularly run a particular query it is just a drop-down menu away. Once you have a stored query, you can come here to request that it also be displayed in your page footer.
This is a purely informative page which outlines your current permissions on this installation of Bugzilla - what product groups you are in, and whether you can edit bugs or perform various administration functions.