Your WWE Universe Mode data and Super Star Threads will be reset to default if you download anything from DLC Packs 2 and 3 and save your game. To prevent this, after you are done downloading your DLC, do not save the game. Turn the game off (the DLC will still be there) then back on. You can now save anything and nothing will be reset.
Play Road To WrestleMania as Christian. Talk to Edge about the Time Machine at the south locker room at the Elimination Chamber PPV. Then, go to the GM Office. Talk to Vince McMahon and he will tell you that the Time Machine is broken into three pieces. The pieces will appear as three green dots on the map. The Edge and Christian action figures can be found between the bookshelf and television. After leave, you will receive a phone call from Edge. The Flux Capacitor can be found in the Green Room. The Phone Booth can be found in the parking lot. Return to Edge with all three parts to get the Time Machine. The Time Machine allows any Superstar to travel to any point in time on the Road To WrestleMania.