Hi Phil, and welcome.
Firstly, what aircraft are you flying with? If you're having trouble landing, it's always a good idea to go back to the basics. Get out the ol' Cessna and practice. Maybe take the training tutorials in the sim, too. It's very easy to apply what techniques you learn in the Cessna to larger aircraft. Don't worry about using the ILS, or any of the Nav system, yet. Practice under Visual Rules so you can see what the aircraft does when you make control inputs.
Some key tips in landing the Cessna...
Trim the aircraft for straight and level flight at about 60% power.
After that, practice climbing and decending using only throttle inputs. This is the way to control your decent to the runway and a soft toughdown.
Give yourself plenty of room to line up on the runway. If you normally start your line-up and decent at 10 miles, make it 15, or 20. What ever you need to comfortably make your decent and line up on the center of the runway.
And: PRACTICE, PRACTICE, PRACTICE!
Hope this helps.
