Installing DirectAdmin control panel on your rainhost VPS is very easy. If you are advanced users and want to install it on other servers you can see this guide here http://www.directadmin.com/installguide.html.
In rainhost, DirecAdmin installation easy as just clicking your mouse.
Step 1. After getting your new VPS information from rainhost. locate your VPS Management panel link, copy that and paste that into your browser.
Step 2. When you entered into RainHost VPS management panel find “Operating System Reload” drop down at the bottom, find Centos 6 x86_64-DirectAdmin and select it.
Step 3. Now Click on “Reinstall Operating System” button. You are done! Now wait 10 min. and enter http://yourip:2222/
Watch this video for above steps