Did you go to Joomla's global configuration and select JCE as the default editor?
If you did then please check your own user profile in case it is set to TinyMCE instead of default.
Hope this helps
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information