Hi Peter,
If you want to force the user to navigate to your page via HTTPS (which is a good security measure by the way), you can do it very easily through LifeTime. For that, you should navigate to the menu entry Environments, select the environment you want to apply these settings, and choose option More Security Settings, like on the screenshot below:

Then you just need to make sure you have the settings under Secure Connections turned to On:

Take into account that after you do these changes you may need to confirm them in Service Center.
Hope it helps.
Kind regards,
João