Adding calories in to the burn meter for breastfeeding?

I just decided to reset myself to sedentary and add in my activities.  How many calories should I add in for nursing?  I've heard it's a range, so would 500 be a good number?

also - sedentary, does that take into account working?  For instance, I sit in front of a computer and on the phone all day long, moving around some but not a whole lot.  Should I log that or would that not even count?  I can imagine there's SOME difference since I am talking and typing at the computer, which would burn more calories than I would sleeping, right?

Just trying to figure out this Burn Meter thing...

When I had my daughter 4 years ago, I was told to eat an additional 500 calories a day while breastfeeding. When I left the hospital with my son 3 weeks ago, they didn't tell me to increase my calories so I'm not sure if things have changed.

I'm fairly certain if you're going to tag yourself as sedentary it means it's the amount of calories your body would burn doing nothing but laying in bed all day. If you type "working" in the search box in your activity log, one of the options it comes up with is "Sitting-Light Office Work." I'd say you'd have to log it if you have yourself as "sedentary" but I'm not too keen on the way it works either.

My doc told me in Feb of this year to increase my cals 200-300 cals for breastfeeding.  I was eating around 1900 cals a day during preg, so 2100-2200 for breastfeeding.

When I was ready to start dieting, the doc told me to add 200-300 cals to my Pre Pregnancy cal intake. If you are going to BF for a long time, just know that your cal intake can affect your milk supply. I'm dieting more consistantly now, and weaning, so my milk is down to about one full nursing a day.

I think you're all confusing your BMR (basal metabolic rate) with sedentary. This site defines sedentary as:

Sedentary

• At work - you work in an office
• At home - you're usually sitting, reading, typing or working at a computer
• Exercise - you don't exercise regularly

So, to me, this already includes office work, so you don't need to add it separately. Your BMR is how much you would burn just laying there all day; sedentary should be slightly above that.

I am not 100% sure of this, but this is my understanding. The "sedentary" description is literally copy-pasted from this site.