I'm new and trying out the free plan right now. I've created two forms where people can sign up for my general newsletter (one pop-up and one in the sidebar). I don't see how to tag these subscribers though, other than the option to create a dropdown menu or checkbox that has subscribers add themselves to a tag, which I don't really want. Is there another way to assign a "newsletter" tag to everyone who signs up through these forms that I just didn't see while I was creating it? Is that only possible with automations (and an upgrade to a paid plan)?