How to remove infopath form from sharepoint 2007?

Question

I need to remove an infopath form from sharepoint 2007 and it is installed as a feature there..so when i am trying to remove it I got an error This form template should be removed only by uninstalling that feature.
Now problem is that..how to uninstall the feature. 
But I am not getting how uninstall the feature from sharepoint, I don't want to uninstall it from
Power shell.