Unfortunately, there is no easy way to add cemetery links for all counties in each state on the GenealogyTrails website: http://genealogytrails.com/. However, if you scroll down to the state option or click http://genealogytrails.com/#state, choose state from the dropdown box, then choose a county from the state list, you should see a cemetery link in most counties. It varies as some state hosts have opted to use Find-A-Grave links instead of compiling a list of cemeteries and cemetery records from other sources. In other cases, they only list the cemetery and latitude/longitude coordinates for the cemeteries. The list of cemeteries is often nowhere near complete.
I include this website because it may be the only website that has the cemetery you are looking for or has an ancestor listed that you can’t find elsewhere. Sometimes, it includes lists to the historical and/or genealogical societies in the county.