Organization level
You can customize emails for the organization. Go to the Global Settings and User Profile menu and select Settings > Email Templates.
To edit a template, click on a template from the list.
Project Level
You can create project-level email templates at the Project side menu > Develop > Email Templates.
You can either create your own template or choose a global email template from the Email template list and modify it. When you modify a global email template, a local copy of the global email template is created and the changes are saved in the local copy at the project level.
You can select a persona from the Select Persona dropdown. The fields from this persona can be used as tokens in the template.
You can disable/enable the emails that use the template with the toggle button on the top right corner in both project and global email templates.
If you toggle off the Enable Email in the Global email template forgot password, the users in the environment will not get an email notification when they click on the forgot password link.