WP Domain Mapping Plugin

I’m in process of trying to learn how to use WP Multisite on chasdemo.com. I want to map another domain to that installation of WP and Multisite. I installed the domain mappimg plugin, and this is now showing up … “Parse error: syntax error, unexpected ‘if’ (T_IF) in /home3/chasd2wm/public_html/wp-config.php on line 96” … Question 1 is, where is it coming from, Question 2 is, how do I fix it, and last but not least, Question 3 is, what exactly are the best set-up options for the domain mapping plugin, for my own use of the system? After I get the system organized, up and running, I can explore the other options concerning allowing outsiders to use the system.