Hi, Debbie, when you have to put your amount you're donating, that number is in pounds.
Thats why, when you put 10 there, they charge you 16 dollars, because those 10 are pounds and converted to dollars, they are the equivalent of 16 dollars.
If you want to donate 10 dollars, the equivalent of that is a little over 6 pounds, so when you donate, put 6 there.
Hope I helped you!
Also, you cant get notification when someone responds to your post.