Configure Settings With Your Registrar/Hosting Provider

Hello,

I have a quick question about the Settings concerning the hosting provider.

I am not sure what I necesary todo.

I have two domains. http://www.principaldomain.com and http://www.secondarydomain.

I followed this tutorial up to step 4.
http://fronterahouse.com/blog/ultimate-wordpress-multisite-domain-mapping-tutorial/

Creating the network I COOSE Sub-directories – type, not the Sub-domains – type.

Both domains http://www.principaldomain.com and http://www.secondarydomain are pointed to /httpdocs/ folder. Is tis all I have to do in step 4 called “Configure settings with your registrar/hosting provider”

Or does the secondary domain has to be pointed to the subfolder /httpdocs/secondarydomainfolder/ which I created in step 3?

O I need to do something else than pointing the domains correctly?

Thank your for yoru help!