All fundamental elements, such as your company name, an email signature as well as the logo visible across the client area, emails and invoices, can be defined in the 'Configuration' section.
Additionally, the ‘Configuration’ section contains the 'Email Templates' tab where you can view and manage templates of email notifications sent to your clients.
Press "Edit" button next to a given template to modify its content and other details.
Remember to press the 'Save Changes' button once all necessary alterations are made.
Note: When editing the template, you can easily add merge fields using dropdown menus indicated on the following screen.