how do i share my gold coin badge reward ?

The gold coins are used for earning badges (bronze, silver, gold)

And, the with daily total of 900 coins to be won, they have made the silver badge requirement at 12,000 and gold at 20,000 coins. Interesting and fun.

No, it doesn't affect your coins anyway. As for the statistics, this is what it says for me:-

Challenges won 834

Challenges played 694

Days completed 166

Bronze badges won 6

Silver badges won 6

Gold badges won 5

coins for this month 16,350.

How I can win more than I've played, I don't know !! But, as you probably know the statistics sometimes play up. I did have a fastest time of 1.09 mins on freecell, but a couple of months back all my statistics changed and now I have a fastest time of
1.25 mins.

Yet again. Coins & badges reset. I think the common factor in my coin loss events is the video advert that it insisted on showing beforehand.

In what area of the app are you referring to? As I can only see coins in daily challenges and these just add up to unlock the badges bronze, silver, gold etc for monthly challenges