Open the template gallery: Navigate to the template gallery in your instance. This can usually be found in the sidebar or in the top-level menu.
Choose a template: Browse the template gallery and choose a template that suits your needs. Templates are organized by category and tags and can be searched by name.
Customize the template: Once you've chosen a template, click on edit icon to customize it to suit your needs. This may involve modifying the HTML, CSS, or JavaScript code to add your own content, styles, or functionality.
Preview the template: Before publishing your Template, preview it to make sure it looks and functions as expected.
Save the template: Once you're happy with your HTML Template, click on the “Save” button button to save the template.
Publish the template: by clicking on the publish button. Once Template is published it will be available in the HTML Template
for embedding.