adafruit 2.8 lcd touch n mega

how can i connect 2.8" TFT Touch Shield for Arduino with Resistive Touch Screen to arduino mega.

Easy, I have the same display. If you go to the page and look at the images specifically the one with the quarter in it, you will see 6 copper tabs by the ribbon cable. The bottom 3 need to be cut and the top 3 need to be soldered. Then just download the libraries. It uses the ILI9341 and STMPE610 libraries.