How to update an item I posted on thingiverse

I posted a design on Thingiverse. I have a new version. Does anyone have any idea how I update the files? I tried using the CONTACT link, but it is not working. Thanks, Ira

just edit the item and delete the old stl file and upload the new one.
I've done it loads of times.

Thanks. The EDIT link was gray'd out so I assumed (stupidly) that it was not enabled. Clicked it and did the update. Thanks again.