Using the keychain on hive.blog
has a post about how to install the new Hive keychain: @themarkymark/how-to-install-hive-keychain
The old keychain extension DOES work too, HOWEVER if you use it as-is you will post to the old steemit.com chain, because it defaults to api.steemit.com.
Go to the settings of the keychain extension and change it to an API that works on the new Hive chain. So far I know about anyx.io, please leave other working nodes in the comments.
Accessing your wallet while wallet.hive.blog doesn't work yet
Use https://peakd.com. All sign-in options seem to be working now. (Earlier I mentioned that Hivesigner wasn't working yet, now it is! @good-karma/hivesigner-released-and-ready)
Transfering Hive to other accounts
If you use the new Hive Keychain this issue should be solved.
Happy Hiving!