1) Hit the get hashes button and connect your wallet to see the hashes of your fortress, you'll be needing these in the next steps
2) Hit the claim button and fill in the prompts, accepting the first of three transactions
3) Next hit the transfer button filling in the prompts as instructed by the site
4) Click the wrap button and fill in the prompts for the last time

When the wrapper asks for your address, use your wallet address, and when asked for the fortress hash to use the hashes displayed after step one