Sync iwatch to my fitness pal

I recently "converted" to the iWatch from the fitbit surge..... My surge i could see how many calories i burned in a day and those calories would sync to my fitness pal so I could keep an accurate count of my nutrition and activity.

I see that i can get steps and HR but not necessarily together unless i have the activity tracker open....

how can I sync my activity calorie burn to my fitness pal?

also, how do I see how many calories i have burned in a day... not just activity calories?

Thanks

Denise