How do I edit a thread I posted parts for sell?

I posted some parts in the for sale section on a thread. I want to update the pricing on the original post and some more items. in the past I had a edit button on the bottom right of my posts that let me do that. I don't see that there now. I saw another thread in this same area that said to reply to the original, that did not work for me today. So, how do I edit my original post?? it is a older post from may.

Thank you

Tim

If it's your thread, look at the bottom where the "post quick reply". There should be a "edit" button