It's actually on La Croisette, right at the start, and opposite the Chanel shop. You'll find hand prints of actors and actresses outside the Festival Palace. Also look out for the red carpet leading up to the building.
Thanks to everyone for your answers! A great help as I sometimes have trouble with mobility, especially steep hills! We will only be there for the day ,luckily during the festival so would love to see as much as possible and people watch.
It is within walking distance. You cannot miss it!
The Film Festival is basically on the Croisette. It's within walking distance of mostly anywhere on the Croisette. You can always grab a taxi at one of the hotels, however, if you would rather not walk.
As the others have said the Film Festival is at the West end and easy walking distance along La Croisette.
It's all togerher
Just a few mins walk, it is by the harbour
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