Login to HELM control panel as webadmin
Click Domain > Click on your domain name
Click Web Site Settings
Under WebSite Extensions, select Version 2.0 for the ASP.NET
Click Save button.

Your domain is now running in ASP.NET 2.0 version. If you would like to switch back to ASP.NET 1.1, repeat the above steps and choose Version 1.0 on Steps [...]

Please follow the below steps to configure the Default Documents for your domain(s) in HELM control panel :
1. Login to HELM control panel.
2. Click on “Domains”. You will see your domain listed on the page. Click on it.
3. You will see all the menu options listed and one of them is “Advance Domain Options”. [...]

Please refer to below for the list of the extension with the limitation on the characters:
.com/.net/.org/.biz/.info/.us/.name/.cc/.tv/.com/.net (3~46 characters)
.cn/.com.cn/.net.cn/.org.cn (3~46 characters)
.com.tw/org.tw/idv.tw (3~46 characters)
.hk (3~46 characters)
.eu (2~63 characters)

ACTIVE: The registry sets this status. The domain can be modified by the registrar. The domain can be renewed. The domain will be included in the zone if the domain has been delegated to at least one name server.

REGISTRY-LOCK: The registry sets this status. The domain can not be modified or deleted by the registrar. [...]

Understanding what happens during the 3 - 4 days propagation period
When you change your domain DNS settings in your domain registrar control panel, these new settings must propagate throughout the worlds DNS servers. It also means that every ISP ( Internet Service Provider ) must update thier DNS records to reflect these new changes, which [...]

Domain Redemption Period is a 30 days grace period hold by the registrar. It is imposed by the Registry and was instigated by ICANN in order to allow clients a little more time to renew their domain name.
After the domains have expired for 40 days, it will enter the redemption period. In the redemption period, [...]

Imagine you are homeless and you want to rent a room or buy a house. In order to get a shelter for yourself, you need a room. So, you imagine yourself as the website and the room as the hosting that you need to place yourself in. That means your website need a web hosting. [...]