Adding a pitch shift tool and arpeggiator-I'm new to cubase

So I downloaded a pitch shifter because the one in cubase 9 elements aint working properly.

http://www.kvraudio.com/product/pitch-shifter-by-rs-met/details

now I dont know how to add it so I can use it… Can anyone help?

And also I downloaded a free arpeggiator called kirnu and I have no idea how to add it so I can use it…

I also saw someone talking about arpeggiator called arpache is this something you have to pay for?