I know how to time travel!
1 space shuttle
2 nuclear engines capable of faster than light travel
1 plasma shield generator
1 computer (preferably with a clock & a world map)
First, launch into space. Then turn on the plasma shield (which protects you from the intense g-forces and your aging.) After that, engage the nuclear engines to 10 to the power of 9 times the speed of light (lot of zeros in this number). By going this fast, you have reached the fabric of time and can now alter it. Set the clock and world map to prefered time & place (say Winter solstice 1945 in Pakistan.)
I'll write more tommorow.