Open the proposal you wish to apply a template to, then from the options menu on the right side you will find a field called "template".
Clicking on that field should open a dropdown menu with all the available templates you've created.

You can't see any templates? That means you haven't created any yet. Click on Settings from your main menu and then click on Templates to get started.
Clicking on that field should open a dropdown menu with all the available templates you've created.

You can't see any templates? That means you haven't created any yet. Click on Settings from your main menu and then click on Templates to get started.
Published on: 28 / 11 / 2018