This is a little late but welcome to OpenStreetMap! Community organisations such as NC Trails are very important and welcomed into our collaborative project. 
I would also like you to read  https://wiki.openstreetmap.org/wiki/Why_can%27t_I_delete_this_trail%3F , this should answer most of your questions.

Furthermore, I would love to collaborate with you on OpenStreetMap related activities. I have experience with trail stewardship and the OSM database. 


