JavaScript - pop up lightbox / form

I want to have a button which will open a lightbox form for the user to submit their email address.   Can someone tell me how I can hook this up?  I have a jquery lightbox which works well on my web sites.  But I am having some difficulty figuring out how to configure here.

Is there another way to have a user submit their name and email address so it will collect somewhere like MailChimp?

Thanks

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