You just add your asset address for now and it will import all your info. It doesn't support sending assets or withdrawing BTC for now. For that we'll have to develop our own open assets UI on top of our BTC daemon with colorcore. That' in the dev tube but for the interim we're pulling all your info via Coinprism's API. So you just have to log on to their site to withdraw or to transfer GHX, all other date is reflected on the cloud as well as GHpool stats and GHfarm stats, mining addresses, dividend payments and so on.