im trying to make a path from the runway to the road but its not showing after compile...ive tried vehicle link, taxi, and path...no luck

 

 

Could be a terrain issue.  If the terrain rises between the runway and the road, then your taxiway will be buried beneath the terrain.  You may need to make an airport background polygon in ADE in order for your taxiway to be visible.  If you do not want to add a terrain poly, then perhaps use an apron poly to create this path.

 

Another thought, if you are using Utlimate Terrain or similar program you may need to set the priority of your modified airport above the Ultimate Terrain files in the FSX add-on scenery menu.