seniors pls help very urgent

seniors pls help me in changing the atr value to 22 in nma swing trading. when i tried the maximum value is only 20 and i was not able to change it to more than 20.

Reference to below:
http://www.wisestocktrader.com/indicators/658-nma-swing-trading-system-nma-i-t-v-3

On line 9: Per= Optimize("atr",Param("atr",10,3,30,1),3,30,1);

Reference to Amibroker Help,
Param( ''name'', defaultval, min, max, step, sincr = 0 )

Check and change the Line 9: Param("atr", 10, 3, Max) where Max is your value you want.

if still not working for you, replace line 9 to
Per= Param("atr",10,3,30,1);