How can I enable the feature in old Tracking Profile? or can I upgrade the old tracking profile to new Universal Tracking?
There's no need to upgrade to Universal Analytics for tracking Custom Campaigns, which would require a new property and analytics.js tracking code if you did - as covered here.
You can view Campaigns in the Traffic Sources section of the Google Analytics reporting interface, as covered here.
Use the URL builder to add Custom Campaign parameters to your URLs, and add Custom Campaign Tracking
ga.js methods covered here. Using _setCampNameKey for example defines the name of your campaign so that it will appear in the list of Campaigns in the Traffic Sources report.