First open Command Center and install Melodyne.
Then to use it in your projects:
1- Right click on the clip after making a "Slide/Drag selection".
2- Choose Region FX.
3- Melodyne is in that drop down menu.
There is another way as well using the Drop down tab in TV.
And be careful, Melodyne is like a drug. Once you fix one small thing, you start believing you can fix everything.
You start saying "One more edit and im off this stuff for good".
Remember, Having small mistakes, faults in your music gives it flavor and life.
Makes it closer to sounding authentic.
Welcome to the forums