To configure your default email template for your account, go to Account > Account Settings in the Admin section of the navbar. Then click on the Mail Template tab and enter your default content. You can use an email signature and whatever default content you want to use. (Note that you can override this template for automated Lead Magnet responses and when sending a proposal through Mimiran.)
Pro Tip: If you want an easy way to insert a link to the content with the name of the content, you can use the “Link to View with Name” merge field.