Just click on the person you are trying to contact directly and you can send them a message from you to them (a Private Message or PM)
This is a great thread/section to find people just keep all the Personal Identification Information in emails and PM the info if it is needed/wanted. PII is just phone numbers, email accounts, SSN, etc.
Since everything you post in threads is viewable in public by anyone (including people/robots that don't have Slingshot Forums accounts) then they can grab your info and sell it to people that want to sell you something, steal your identity, electronically harm you, etc.