When you return an item on Time Tangled Island, the time device shows "green" for that time (there may still be objects to come from there). When all times are green, travel to the Lab (12 o'clock. the present). Use the Future Machine to travel to the restored future and get you Island Medallion.
You have to go back through the Future machine to reach your future self in the repaired timeline. Make your way to "your" sky home in 2059. This is where you get your medallion, from your "future self". (see the related solution question)
On Time Tangled Island, click on the crab several times until he explodes. (Not to worry, he rapidly pulls himself back together.)
To get the torch from time tangled island you must go to the viking and blast open the cave and you will receive a torch you must make to the vase before the torch goes out.
in the time machine go to the future and make your way to the top left and you will find your future self but the future is better. talk to your future self and you will get the medallion
When all of the time periods have been repaired, all 11 items returned, the Time Device will be all green, and the Lab (12 o'clock) will flash. Use the Lab setting to go back to the "present", at Pendulum's Lab. Power up the Future Machine to go to the restored future. You will make your way to the sky home of your "future self", where you will receive the Island Medallion.
When all 11 items have been restored to their proper times, all the times on the time devices will be green. Use the Lab (12 o'clock) setting to return to Pendulum's Lab. Use the future machine to return to the restored future. Make you way to your Sky Home to get the Medallion from your future self. (see related question)
Sync the 2 clocks. Move your cursor over one clock to make it move faster than the other. Try to make them both stay the same until it gets to twelve o'clock. Then the skull will come out in the same time and you will get a lantern.
Once you have travelled to the future and received the Time Device, click on the small icon at the lower left to open it. Then choose one of the 11 time periods (12 o'clock is back to the Lab) and press the flashing button on the left side to travel.
go down the ramp on the left side and there is abig thing that you connect to the big eletronic hole.
When you have returned all the objects to the proper time, the time device is all green and the "Lab" at 12 o'clock flashes. Use the device to go there (Pendulum's Lab on Main Street) and power up the Future Machine to go back to the restored future. There, you have to make your way right, then use the monorail -- the exhaust from the fans will push you to the other monorail as you go left. Take the small elevator pad to your Sky Home and receive the Island Medallion from your future self.
After you have returned all the items to their own times, all the places on the time device will be GREEN. Use the LAB setting to return to the present, and the Future device to bring you to the restored future time. To get to your Sky Home, go right (and swim) until you reach the air tube. Go up to the monorail and get aboard. Use the monorail exhaust to lift you out of the car and onto the other monorail car. When you reach the lift platform, take it up to the roof home. That is where you get your Island Medallion.
Once you step inside the cave they automatically give you a torch. Then you jump over three pools of water then the give you a new torch and then you make your way out.