Look online for pay&play, plenty of info out there, people aren't going to tell you Greenlane locations on a public forum, you will have to research like we all have had to, get some o/s maps and use trailwise also check with local authorities that the lanes are legal at the time to drive
Also keep an eye out in the green laning section for trips out and politely ask If you can tag along
Please use the lanes sensibly though, not as a pay and play, thee are guidelines to follow.
Alsohave a look on glass website, some good info on there