Thank you for contacting us. While you can change the icon for your type to a default icon supplied with the mSecure app, you are not able to change it to a custom icon, like a picture you have taken or to a site icon downloaded from our server.
The only way I can see to apply a custom icon in on an Item by Item basis. I would like to apply the custom Icon to a Type template so it will be inherited by the item, to avoid having to apply it on an item basis. M5 for the PC only allows me to apply Standard icons from the M5 icon library to a type template.