In the extension, there is something not to have permitted the buttons. In that case, all buttons are not displayed. The button of Templater is not similarly displayed.

In that case, it is possible to look for following code, and to keep effective by the rewritten thing.

example:

from

echo $this->editor->display('text', $this->article->text, '100%', '400', '70', '15', false);

to

echo $this->editor->display('text', $this->article->text, '100%', '400', '70', '15', array('image', 'pagebreak', 'readmore'));

Buttons other than image, pagebreak, and readmore are displayed by rewriting it like this.
(The parts of $this->editor are written $editor, are other names, and note it, please. )