To help get you started contributing, we've created a tips for new contributors page, full of helpful links about policies and guidelines and style, as well as some important information on copyleft and basic stuff like how to edit a page. If you need help, check out Wikivoyage:Help, or post a message in the travellers' pub.
By the way, have you considered creating an account here? While you can absolutely keep contributing as an anonymous user, it promises a bunch of benefits, and no obligations.
Also, please have a look at Talk:Mount Hagen. You are not automatically assumed to be acting in bad faith, but neither are you automatically assumed to be acting in good faith, with this kind of edit. The difficulty with it is that it may be entirely accurate but also has the appearance of crapping on one hotel to tout another, which for all we know could be at the behest of the benefited hotel. So your participation in the linked thread, with some kind of citation if possible, would be most helpful.
All the best,
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