This page is to allow administrators to add people DIRECTLY to the email list on MailChimp.
This assumes that you were given permission to add this person to this list. This person will NOT receive a confirmation email from MailChimp like they would if they were to sign up on their own. Since you are adding this recipient manually, they won’t have an opt-in IP address or date in your records (not a big deal, but some system administrators like to have that).
If you would like to avoid any possible conflicts, they can sign up directly using the standard Newsletter sign up form located here.