I've tried the following in both Chrome and Firefox:
1. Create an account at https://bitshares.openledger.info/
2. Settings->Restore/Import->Import a private key
3. Paste WIF key from BTC wallet that was used to send to 1ANGEL address
4.  Click "Submit"
5. "Found key." appears above private key input box.
6. ... and nothing else at all happens.

I am an idiot, so how do I do this?  I was following these instructions:
http://docs.bitshares.org/bitshares/investor/claim.html