How could i change the cloth of the character. what should i do to import the model into the blender .
It’s not possible, the Oto model was made in blender 2.49, and there’s no ogre importer for that blender version.
You can get the original model in .blend format here:
xD. He really love the Oto http://hub.jmonkeyengine.org/groups/general-2/forum/topic/change-the-appearance-of-characters/