I'll probably write up a wiki article on this subject at some point (assuming there isn't one available already), but for now:

Modest is a new addition to bugzilla, so there shouldn't be much on there right now. If a keyword search doesn't turn anything up, you can also check using a component search for Modest (Communication:Modest), as there aren't many bug submissions so far.*

If your bug hasn't already been submitted, then you can go ahead and create a new one. Component should be Communication:Modest, then go ahead and fill in all the other fields (IT OS for OS and your device for platform).

The summary and comment fields are probably the two most important fields. Use a lot of keywords when you write your summary (while being clear with the nature of the bug ), as this is what people search by default.

The comment field is where you write out a full description, expected and actual outcomes, and steps to reproduce (if relevant). bugzilla provides you with a template, which you need to fill in (and edit). Under the "STEPS TO REPRODUCE THE PROBLEM" heading, enter a step-by-step howto guide on how to reproduce the bug (this is very important, as it'll make the difference between your bug being fixed and developers being unable to reproduce the problem). Be very clear here.

The next two headings, "EXPECTED OUTCOME" and "ACTUAL OUTCOME" are where you describe how the software should work and how it actually works due to the bug (Expected: the automatic retrieval setting is off, so Modest will only retrieve mail manually. Actual: Modest retrieves mail regardless of automatic retrieval setting).

The "REPRODUCIBILITY" heading is used to indicate how often the bug occurs (usually "always" is the case). Please remember to delete the "(always/sometimes/once)" selections before you submit your bug. These are only recommendations and should not appear in submitted bugs (even Quim is guilty of this misstep, so I can't really blame people too much for it ).

The "EXTRA SOFTWARE INSTALLED" isn't always relevant, if you think that something you've installed has had a hand in the bug, then mention it, if not, delete the heading.

The "OTHER COMMENTS" is where you add additional comments, use this for whatever you think is relevant. If you don't use the field, delete it!

If you need further clarification on any of the features of bugzilla, please feel free to contact me!