Excel Question real quick

[Skelator03]

Ok i am doing my office pool and i have it all done on excel well in excel when you have a formula in you can drag it down and it will not copy but change the letter / number of the grid by one in the formula so it will add all the points for me based upon who picked what team now here is the question how do i duplicate this effect on my phone cuz i have been keeping track of my score but cant figure out the drag function thanks a lot