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Hello! Ok I'm trying to write to Union J, a British boyband and I'm confused about how to do it. I'm sending a card and letter and SASE in a 6 x 8 inch envelope. I enclosed $2 because I can't find any British stamps. But I'm confused about how many American stamps I have to put on the letter I'm sending. Someone told me 3 and someone else said 6. HELP!

go on the USPS website and they can help you out.

Or just send it from a post office or your local UPS store/postnet etc
I send mine from my local Postnet store and they are super helpful. I know generally it costs $1.10 to send to the UK, so 3 forever stamps should cover it.

But if in doubt, go to the people who post things for a living.
It is their job to help you