[sawce]

Mouse over your username, a drop down will show (it's not a menu, just a quick display) that shows your your rights.

If "Modify Own Issues" isn't green then either ignore it if it's something trivial (unimportant typo) or just post a comment about it

If it IS green, the edit button is right above the comments tabs labeled "Edit this issue"

edit: just checked, no you can't modify an issue. just post a comment if it's important.