Updated ad doesn't show up?

What do you mean by it has not “showed up?” Where is it supposed to show up? If you updated it, it is still exactly where it was before.

However, without a link, there’s no way to confirm this.

I've updated my for sale ad, how do I  publish it in the for sale thread? Thanks

If you're talking about moving it to the top of the list, you can't. You have to compose a new post.

If you want it to appear on the first page again, you have to delete the old post and publish a new one. Copy from the old post, and paste it into the new one.

You still didn’t provide a link, so I may still just whistling be in the wind here.