Wikipedia:Welcoming Committee/How2Help
Point out problems - most Wikipedians started off when they were reading an article and thought to themselves "that's not right" - and the best part is, you can change it...it's a Wiki!.
Create new articles - creating a new article is often a very useful thing to do, especially if there are lots of articles linking to an empty page. Wikipedia articles contain lots of links to other articles. Blue (or purple, if you have already visited them) links represent pages that do exist. Red links (or tan, if you have already visited them) point to pages that don't yet exist. Whoever created these links thought that an article on the topic should exist. If this was not a popular idea, the link may have been removed. It's also possible that a spelling error was made, or that they didn't know the correct name for an existing page on the same (or a more general) topic. In this case, you could fix the link, and/or create a redirect. If you decide there should be an article at the other end of the link, by all means start writing it!
Make a Donation - Wikipedia is in constant need of more server capacity, bandwidth, and other technical services, to keep it running and fast enough to be useful. Financial contributions to our non-profit parent, the Wikimedia Foundation, are greatly appreciated. Please see Foundation/Fundraising - your donations count.
Start on a task - there are numerous tasks in every walk of life that can get done...from aviation to zooology, from Music to Sport - the list goes on and on. See Community Portal/Tasks for the full list.
Start on a random page - click here to go to one of the 7,015,934 that Wikipedia english has, and start improving!
Not your cup of tea? Can't see anything above that interests you? Well there's a lot more at Wikipedia:Contributing to Wikipedia - go on...it's a Wiki!