that's for an automatic UKant... for a manual you have to crawl under the car, open a plug and stick your finger (it's just easiest) and check the level of the gear lube... but it could be a clutch problem, sounds like it might not be engaging the clutch like it should. Even without lube/fluid the transmission should work unless you fucked the gears up inside there, and I know this because an old truck I have had a tranny that had 0 fluid/lube in it and it shifted fine until I broke the gears "hot rodding" it....