BE tokens are assets created on the Waves Platform. When you buy BE tokens from the website you will need to have a Waves address in order for us to send the tokens to you. You do not need to have a Waves address when you buy as you can send it to us after your purchase.
Full details on how to create your Waves address are here: https://support.wavesplatform.com/en/knowledge-bases/2/articles/4228-get-started-with-waves.
The waves platform also has an exchange where you can buy and sell your BE tokens for other digital and fiat assets.
If you have any problems just create a support ticket.
Customer support service by UserEcho