Besides the menu item type, Secure Messages ships one site module. It is installed together with the package but, like every Joomla module, it is not published automatically: go to Content > Site Modules, open it, assign a position and the pages you want, and publish it.

Secure Messages - Send Form

Shows the same public send form as the component's page, in any module position: the message field, the recipient choice, the expiry/burn/password controls you allow, and the captcha if configured.

• The module has no settings of its own. Everything - recipients, field modes, captcha, custom CSS - follows the component options under Components > Secure Messages > Options.
• Only one send form can appear per page. Don't assign this module to the page that already shows the send-form menu item (or place two instances on one page); the second form won't work.
• If no valid recipients are configured, the module shows the same "sending is unavailable" notice as the component page.

This module is useful when the send form should appear somewhere a menu item can't put it: a sidebar, a footer, or embedded on an existing content page such as your contact page.