That's not the caption of the image. 

 

You can put the image/image description into a box (div)  then use style builder, change the float style of the div to left or right.


For example:

 
This is a description

 

 

Cute Editor for ASP.NET is the most powerful WYSIWYG (What You See Is What You Get) browser-based Online HTML Editor for ASP.NET.

It enables ASP.NET Web developers to replace the Textarea in your existing content management system with a powerful, but easy to use WYSIWYG HTML editing component.

It empowers business users to make content updates easily and safely themselves while maintaining control over site design and content, all at an affordable price.