Bugs and Milestone

Hi,
I am a novice in the FCKeditor development process and so I have some questions.

I have found some bugs which are opened but do not have defined Milestone fields. The bugs are not assigned and do not have any actions for the last month or more. If the bug is significant in my opinion what I can do?
If I found new bug and wants to submit new ticket what criterions I should use to define the Milestone field?