Get bubble wrap from any stationery shop / post office
Get a sturdy box
Wrap the camera around in the bubble wrap, be generous so that it is padded well for any shocks
In the box, put some padding as a cushion, even newspaper will do
Put wrapped camera in
put any paperwork you need on top
seal box
write address
put your "from" address on there
Send Special Delivery by 1pm or use parcel2go or equivalent
basically what I done when I sent my 5dmkiii to Canon for a focus screen fix