Greetings edillons!
It is possible to block access to apps included in the Helix TV service by going through the settings menu on your Helix TV terminal (you will need to do this on every Helix TV terminal you have):
1. Helix button
2. Settings (cog icon)
3. Parental Control
4. Choose a parental control level and PIN number if desired
5. Application Locks
6. Select the application you wish to restrict
I hope this helps!
JFrancoisD