You can mark a thread as "Resolved" only if you started the thread. To do so:
- Click the Gear icon at the top right of the first post in the thread to show the Thread Tools menu. This is normally next to the Watch/Unwatch Thread link.
- Click on Edit Title.
- Change the drop-down in front of the thread title to Resolved.
- Click the Save Changes button.
Marking a thread as Resolved is a hint to others that a solution or explanation was found or that you no longer need help or advice. It does not close the thread or prevent others from making comments if the subject is still of interest to them.