To get started connecting to Ethereum public node, choose your Ethereum node and click on the <connect> link on the actions menu at the bottom right:
You will get to the connection method page. Choose the Mist browser package and download it for your platform if you haven't done so previously.
Note: You may get an error telling you that your permissions are too open. Here is how to fix that.
After download and install you can then launch Mist (either from Terminal or directly from the executable)
For OSX: open -a Mist.app --args --rpc http://127.0.0.1:8545
Windows: "C:\Program Files\Mist\Mist.exe" --rpc http://127.0.0.1:8545
Linux: mist --rpc http://127.0.0.1:8545
This will load Mist and connect you to Ethereum.
Your Mist wallet mgt application: