There are really just a few steps;
1. Create Payload for the iOS restrictions that you want
2. Create a new Software Profile (or use the one that you already have) -- Edit the profile and add the new restriction payload to the profile
3. Make sure that the Software Profile is applied to the folder that your device is in. Remember that things can be applied at a top level and everything is inherited or you can apply to a specific folder
4. Do a Universal Deployment or Synchronization for the location or the top level to be safe
5. Update the device.
Hope this helps.