Yes that's right. The sign-in pop-up appears and that's where you need your active key. At least it means your general navigation around the site is via your Posting key - good :)

You can add multiple sign-ins to the saved credentials, at least i can on chrome.

if you add /active to your username when you put the active key in, the next time you should be able to click on the password box when signing in and choose 'sunlit7' or 'sunlit7/active, and not need to find the key each time.