It should have remote locking. Being a '94 it will need a one button fob, have a look at http://www.remotekey.co.uk/cars/land-rover/discovery-I-1993/ for more info.
The diff lock can be moved with some not so gentle force if necessary, but if not do a search on here for how to free it off, there are a number of threads about it.
Welcome to the wonderful world of Landrover, it's addictive.