If you go to the section you want to place the new post, Defender or TD5 , your choice.
As you scroll down before you get to the first post in that section , just above the dark green line on the RH side is a NEW POST button , click on that.
Or you can continue with just one of the posts you have already done. The one in the Disco section is probably not the best one to keep going though.
At the moment you have posted in 3 different places, you are going to go mad trying to keep up with that lot. ....LOL
Does the engine turn over? is it cranking , just not starting?
Can you hear the fuel pump running when you turn the ignition on?
Have you checked the battery voltage? can you check it when it is cranking?