You will only have access to V-Vocal if you have an older version of Sonar which included VV still installed on your system
If you have deleted all earlier versions, you'll need to do an advanced install of whatever version you own, and deselect everything apart from the program itself (V- Vocal is NOT a plugin - it's a
process)
You access it in X3 by highlighting a section in Track View and select "Region Fx" where you should find it, along with Melodyne