Melbourne ecommerce theme - Customising your password page
From Spiffy Stores Knowledge Base
Colour scheme and layout
The Melbourne now includes a styled password page, which can be enabled in the Preferences -> General Settings -> Password Protect Access to your Store section of your store admin.
Once you have enabled password protection, the page can be customised by uploading your own image, customising the title, and customising the text colour. This can be done in the Password Page section of your Theme Editor.