[eluser]TheFuzzy0ne[/eluser]
The way you are doing it is fine, but you are not assigning the return value to a variable, and the model clearly isn't loaded.
Models can be loaded in one of two ways:
1) $this->load->model('model_name');
2) Add it to ./application/config/autoload.php
There are other ways of doing it, but it makes no sense using them since the you have the two options above available to you.