Hello :)
First check licensing ;) Since this is a licensed feature, make sure the license is imported and active.
If so, navigate to Provisioning >> Resource Performance Tuning >> SmartQoS
Once there, you can see two tabs: Priority Control and Traffic Control
When in tab Priority Control, you can choose the Resource Type: LUN, Filesystem, or Snapshot
In Traffic Control, you can go through the wizard.
You should also be able to navigate to: Provisioning, Share and in that window RMB click on the share, select Properties and navigate to SmartQoS in there.
Hope this helps :)