Once you find a template you like, you can preview it and use it.
To preview a template, click the Preview link on the right, and a full screen preview of the template appears in a new window.
To use a template, click Use this template and a copy of the template is created and added to your Docs list. You can start editing this document directly in Google Docs and sharing it with others. You need to be signed in to your Google Account in order to use a template.
When you use a template, you create your own copy, so it doesn't matter if the template owner changes or deletes the original template; your copy remains unchanged.