You can view your available templates by clicking on the Wiki button in the top menu.
When you create a new Wiki from the My Wikis homepage, the New Wiki window that pops up includes a Wiki template dropdown that lists your available templates.
To create a template from an existing Wiki, go to that Wiki’s homepage, make sure you are in edit mode and then go to the Wiki’s settings – these are the cogs at the top of the homepage.
Turn on the Wiki template button and give the template a name and, if needed, a description. Click Save and a template copy of the Wiki will be added to your list of available templates.