Just send mail to email@example.com
I would be happy to receive reports of mistakes, typos, unclear text, missing explanations etc. on this website. If you prefer - it is possible also to report it on the issue tracker.
I can consult on this topics, please contact me to discuss details.
If you have general OpenStreetMap question and you are not looking for a consultant - see openstreetmap.community - an overview of a global and local communication channels used by OpenStreetMap community. That will direct you to the best place to ask such questions. OpenStreetMap mappers will help you there. Maybe me if you end in place where I am active at a given time :)
In case that somebody needs it - my GitHub profile.