If I understand correctly, you want to set the value of the settings from the code. In "Access in Code" topic describe how get settings values from slice. To set slice value you need to do the same, it's just the opposite
this.ObjectSpace.AppSettings().Root().KeysFCSettings().KeyString.Value = "new value with updater";
Feel free to contact us if you need further assistance or have additional questions.
Regards, Mariya On behalf of Xafari Client Services Team
Okay thanks! But how to commit changes in a Controller?