Please try the following steps.
1. Go to a List item page. For example Wiki or Blog.
2. From the Site Actions
menu go to Site Settings >
Modify All Site Settings
3. Click Site features in the Site Administration column.
4. Scroll to the bottom of the list and activate the Use RadEditor to edit
5. IMPORTANT! If you still see the default editor or a simple
textbox after you activate the RadEditor feature(s), you might need to open a
command prompt window and type iisreset to reset the Internet
Information Server. This will prevent problems caused by caching.
I hope this helps.
the Telerik team
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