AFCAD AND SCENERY ADDONS

Hi. Please can someone point me to a tutorial. There are many Scenery addons with afcad which I have had to ignore. I downloaded 2.2 but there is no tutorial on it. I tried adding the missing taxiway to Fairoaks. I saved it, but it will not transfer to addon scenery folder. Also one of my scenery downloads has landclass scenery. What do I do with it?
Thanks
Thanks
