As some are aware, I am one who tries to offer informal mediation through less "formal" means, such as by offering a third opinion, by mediating on the article talk page, or mediating in my user space privately. I will help all those who ask of me, as long as I'm not overloaded at the present time.
The easiest way to ask for mediation is to leave me a message on my talk page. However, please note these things:
I cannot take sides in disputes. The role of a mediator is to act as a third party, one who is neutral, to help "mediate" a discussion between two or more parties. I will weigh in on the discussion as appropriate to guide things along, reminding editors of applicable policies and guidelines in the process, however.
I cannot make binding decisions. I have said this many times in the disputes I've mediated, we cannot make binding decisions. If that is what is required, I would suggest filing a request with the Arbitration Committee.
Mediators discuss disputes in article content, not user conduct. The process for dispute resolution would be filing a report at the Administrators Noticeboard/Incidents.
Proposal pages can sometimes be used. I have a template for these here.
Archives
This is a list of archives on cases I've mediated, purely so if the parties need the content that was discussed, it's still accessible to them.