You can go to your opt-in form and generate a link that you can send for people to sign up to your list. On the "Publish" step of creating the opt-in form where you are presented with the HTML code to add to your website, you can copy the part that starts with <http://oi.vresp.com?fid....> This address should be found on the very first line of that HTML code. You need to copy everything contained between the quotation marks at the end of that first line of HTML code, but not including the quotation marks.
People who click on that link would be taken to a very plan looking opt-in form, but you can make it a little more personalized if you add a picture in the "Pop-up or Redirect?" step of creating your opt-in form.