Clip Share V4.1 Configuration set Up

I have just purchased a Clip-share v4.1 video sharing script. I have had it installed by the company themselves. It all seems ok but I have a few issues I need sorting out. Primarily, when a user registers, the system is supposed to send out an email to the email address provided, and the registrant clicks the link in the email to complete the sign up process - effectively validating their email address. This does NOT work. There is a tab in the back office called Mail Configuration and within that there are these fields which I guess set up the email system. Mailer: Sendmail Path: SMTP Server: SMTP Port: SMTP Prefix: SMTP Authentification: SMTP Username: SMTP Password: I CANT get it to work. I need URGENT assistance to get this set up, but you should have experience of dealing with this script before and you need to demonstrate this to me. Also, do you have a clipshare v4.1 user manual? I will give the job to the first person who can help me. Need job done on today - Sunday 28th June 2009. Please respond.