I've got a joomla project. Within this the written text editor is small mace. But there's no choice to upload a pdf. So I wish to implement Ck editor or fck editor rather than small mce. I've downloaded ck editor and install as always way (admin side ->extension->install- un-install section) and disabled the small mce in Wordpress plugin Manager. However I can't show the editor I believe I'm in wrong way.

Does anyone have idea? Help me.

Reached Site > Global Configuration, make certain you are around the Site tab (usually pops up automatically), then choose CK Editor in the dropdown for Default WYSIWYG Editor.