First thing you need to do is head over to the Communications tab.

Then click on Message Templates to see a list of all the templates for your project.

Here you can check your Templates by clicking Preview. 

Clicking Preview may result in this error.

This is because you need to have at least one recipient ready to generate a preview. So, in order to do that you will need to markup some submissions to your templates target.

Click Here to see how to mark up submissions.