In order to do that, In order to unlock the Chamber of Time, you need to open the door in the Vault of Secrets by completing "The Challenge" and ??? will give you a hint to the vault if you click the orange lock. Just simply go to the "Coming soon" page on the list of main levels, Click the "Info" Button then click the bottom of the screen (or the ground) and a door will appear. Once you do that, "The Gatekeeper" will tell you to verify you are Rubrub. (which you aren't) he will ask you for the "Master Emblem". The master emblem is in the secret shop (Scratchy's shop located in the treasure room) Buy it for 1000 Orbs and you have it. go back to the coming soon page then click the door. once you enter the chamber of time, you will find a chest where the orange key is.