I think I mis-understood what this plugin does. I was

I think I mis-understood what this plugin does. I was hoping for a simple text box & subscribe button that people could input their email to be subscribed to our mailing list.

1) Can this plugin do that?
2) How can I edit the color/size of the subscribe button?
3) If it can't do that, can you recommend something that can?

I have Magic Members and people (will) sign up for that, but I also want a very simple way of having people subscribe to a non members mailing list.

Thanks!