How to develop indicator where you can change the time?

Hello,

I want to develop an indicator based on Mark Fisher's ACD system. It involves looking at the opening range in a given market, drawing 2 lines or the high and low of the opening rnage, then drawing two further lines up and down based on between 10-30% of the daily ATR.

I have used MT4 before. I am not a programmer but I managed to modify pre-existing indicators for my needs. I cannot find anything that is similar to this in CTDN. There is the pivot indicator here which is slightly similar, and also relevant to ACD, but then the time for that is fixed -- I cannot change the time based on the market, which I need for this method.

Can anyone help?

Thanks