How to edit thread title?

[fourrings]

I cannot find a way to edit the thread title if my life depended on it. I can change the title within the message, but I'd like to update the thread title as well so someone doesn't have to go inside the message to find out my bike was sold.

Thanks!

[azalway1]

I'm just as frustrated considering I dropped the price of my bike $500 but who's gonna know unless the title suggests it!