Where is the FAQ?
Why can't I add comments to questions?
What do I need in order for this function to be availed to me?
migrated from stackoverflow.com Dec 19 '09 at 11:34
This question came from our site for professional and enthusiast programmers.
You probably can't add a comment because you haven't reached the necessary reputation level.
Here's an explanation from the FAQ:
On Stack Overflow, Server Fault, and Super User
This means that, once you've reached 50 reputation, you will be able to comment on any question or answer. However, "you can always comment on your own questions and answers, and any answers to questions you've asked" with 1 rep.
On Meta, the reputation requirement is different, because of the genre of the site.
So, you can comment on ANYTHING with 1 rep, but this only applies to Meta.
By the way, just for clarification:
This SO site is called Meta, it's for discussion about Stack Overflow.
If you don't fully understand the concept of reputation, here's an explanation from the FAQ: