I hope you mean +35 and not -35. Negative will make that thing twice as twitchy.
To change the input value so you can edit it, you just flip the associated DR switch to the next position. If you have not watched my DX6i videos, I do cover this in there, I think lol. Might put some light on some other things that you didn't even know you wanted to know lol. Have a watch by clicking on the Articles tab above, and clicking on the DX6i link on the left.