Need Help sending a PDF form to a mailing list and with signature field not working

I have  A list of about 15 people that  I need to send a PDF form to and each one needs to sign individually (separately) and send the form back to me. They are not signing consecutively. I am not seeing anywhere in the help where this is discussed and I don't want to send it out where everybody sees each other's email. I really don't want to send the form 15 separate times. all the help articles mention Adobe sign. Is there a way to specify a list of addresses and will the emails send individually?  Another issue  is that I really am not sure where the "Adobe sign" Tool is. I looked through all of the tools and I do not see it. Is it the same as the send for signature on forms. I am using Adobe acrobat DC standard And I have it installed on both a Windows 10 PC and MacBook Pro laptop. I can send this using Acrobat on either OS. 

Also my signature field is not a signature field even though it has the type marked as "signature".
It does not have the little red flag to note that it is a signature and when you click in it to sign you can just type in it. What is wrong?? is there something else I need to do?