First of all go to the home screen of kika app as shown like below...Next you will see settings button at the bottom right corner of screen...click on it..
In the next page you will see an option of Advanced Settings..
In advanced settings there is an option named as Key Long Press Delay. Click on it to change the default value..
Clicking on it will give you a slidebar. Using slidebar you can change the value of delay as shown in below image.