The most popular websites to buy bitcoins are BitStamp.net (exchange market) and Coinbase (wallet). From these, you can withdraw your Bitcoins and send them to your Coinprism Bitcoin Wallet.
To see instructions on how to buy Bitcoins and transfer them on Coinprism, please read:
- How to buy Bitcoins and transfer them to my Coinprism account with Coinbase
- How to buy Bitcoins and transfer them to my Coinprism account with BitStamp.net