Oh I get it now - duh. You are asking me how to contact that researcher.
Okay, what I posted is a link to an Ancestry.com message board. She posted a message on it in 2005. Beside her name is a button to click to see her posting history. She might have made more than one thread about this family. To contact her via Ancestry.com, you have to be a subscriber to Ancestry.com. Otherwise, the "Member Connect" service does not work. But if you are a subscriber, you can send her a private email via Ancestry.com. If that's not an option you can respond to her post, just like you're responding here in this thread. Anyone can sign up for free for the Ancestry message boards - very similar to Genforum. Theoretically your reply would be sent to her email. (It's been a few years, so one doesn't know if her email may have changed.)
You can also try to find her with Facebook, or a People Search service.
Also, use Google or another internet search engine and parse with her name or the names William Lowe and Mary Sandelin or other words/phrases. I think I saw a Genforum post by her. As you know with Genforum some participants make their email available, so if you find a Genforum post by her, you might find her email that way. On Genforum we click on a name, which takes one to the email address (if it has been shared).
Also if you visit Genforum and Ancestry.com message board with your new clue of "Sanderline" or "Sandelin" or "Sandlin" or whatever, you might bump into her that way.
That's all I got - other than that I don't know how to reach her.