arduino due not appearing in "boards" list??

hi guys so i am connecting the DUE to the Ide for the first time and i am having some difficulties in finding the arduino DUE in the boards list. i have tried to fix this problem myself however there is not much on the web about this matter. i have also tried selecting another board from the list of "boards" it will let me compile and upload to a point then this error comes up,
avrdude: stk500_getsync(): not in sync: resp=0x00 can someone help me please am i doing something wrong or is there issues with software i should know??

Are you using Arduino IDE version 1.5.x or higher (current version is 1.6.2)? Version 1.0.X and earlier don't have support for the DUE.

Due isn't automatically loaded into the Arduino IDE.
In the Arduino IDE go to:
Tools -> Board -> Boards Manager
Look for the Due (SAM) software at the bottom.