It depends on which Snap! you are using - Snap! by Lectora or Snap! Empower. Snap! by Lectora rapid e-Learning software is a PowerPoint plug-in and probably what you saw in the image. Snap! Empower Flash interactions builder is a standalone product that allows you to create very robust Flash animations. Snap! Empower is not a PowerPoint plug-in.
Based off of your question about editing templates, it seems as though you are using Snap! Empower. If you go to the "Help" menu in Empower, you will see a TON of information about how to use Snap! Empower - all in text so you do not have to watch any videos. You'll find the User Guide - take advantage of this great resource. In this guide, you may find the "Managing Templates" and "Editing Pages" sections to be useful.
