Type in w4 on upsers. You can edit it all there still. But it's gotten tricky.
https://aboutblaw.com/NNf
Simply put, instead of 0 through 9 withholding allowances (and your 10 options), we have six sets of withholding figures.
You kind of have to cross reference the old method and the new method. If you wanted 9 allowances for one week, and you're at the $1900/WK threshold, to get close to that, you would need to change yourself from Single to married. If you're trying to only get $170 withheld, you can't just set it to 9. You have to change your status for that sheet. I don't see how this is helping anyone.