Bugzilla: Reopen a Bug Report
Bug reports may be reopened if they were closed in error or the problem occurred again.
On the bug report that you are editing, find the Status line, just below the Additional Comments field.
Change the Status value to "Reopened".
You may want to enter Additional Comments about why the bug is being reopened.
Click the Save Changes button.
The bug will be automatically assigned to the default programmer. You may need to edit the bug again if it should be assigned to someone else.