Mediaconverter is great for this, but it only allows converting 5 videos per day. For something free you can combine converters like flvto and convert-to-ogg, to convert to MP3 and then to OGG from MP3.
You should be able to create articles and add new sections, unless the article that you're editing is protected, or in case (which is unlikely) that wikia has disabled editing of new and ungregistered users in your wiki.
I know that in the Club Penguin Wiki you must be 4 days old in wikia in order to create articles. In what wiki are you not able to edit mainspace pages? Do you refer to the english wikipedia?
Well, I tried to make my own wiki named "MotleyCat74 Movies" but I got the community Wiki instead. And this one time, I tried to make a page, but it said "I don't have the permission to create new articles in the Article namespace."
I need help. When I tried to make a new page, it said that I don't have permission to make a page in the Article section, like, for example Cayby J made a new Wikipedia page called Go!Animate The Movie (2006 film) but I can't do a page like that. What should I do?