You shouldn’t be seeing that popup after you have logged in to the site so I’m not sure what is going on there.
Looks like you joined on 6/4 and I don’t think she has sent a newsletter out since then. It’s a little different for members in that to subscribe to the newsletter you click your profile at the top(yours is a lemon) and then click “Email notifications” and check the box for newsletters.
Hope that helps.