Keyless remote i just purchased a remote from ebay for my 96 jeep grand cherokee, when i bought the vehicle it did not have a remote, how can i program it myself

Try this I can get you more info if needed have a good day DB
Notes SYNCHRONIZATION (ROLLING CODE) BUTTON TRANSMITTERS
The transmitter code will go out of synchronization if the button is pressed more than 255 times outside the range of the receiver which is inside the Door Module. In other words the transmitter will not work. To synchronize the code of the particular transmitter with the receiver, press and hold both lock and unlock buttons simultaneously for 5 seconds . Release the buttons and wait until the doors unlock indicating that the code has been synchronized. This may require waiting for as long as 6 minutes .