I received the display yesterday but still waiting for cables. Based on what I found so far I think you try to connect
TFT -> Mega
LEDA -> 5V
VCC -> 5V
RD -> 3.3V
GND -> GND
DB0..DB7 -> pin D37->D30
DB8..DB15 -> pin D22->D29
RS -> D38
WR -> D39
CS(pin6) -> D40
RSET -> D41