Then let's get you started. You can read any page on UserBase without creating an account. Maybe for a day or two that will be enough, but sooner or later you may wish to use a Discussion page to ask a question about a page. For that you will need to have created an account. Don't worry, though, it couldn't be simpler.
At the bottom of the sidebar on any page you'll see the "Log In" link. It's the same link, whether you are creating an account or using an existing one. Follow the link, choose your username and password, and you are ready to go. You'll notice that under Personal Tools it now shows your username, and you have some other links. Take a little time to browse those pages, especially the "My Preferences" page.
No doubt you have lots of questions, and UserBase looks a little daunting at first sight, but there are many pages that help you get started.
At the bottom of a page you should find a category link, which will look like [[Category:Getting Started]]. If a page is relevant to more than one category it might look something like [[Category:Getting Started|Contributing]]. If you hover over the category statement (the real one, not this display dummy) you will see that each of those categories is a link to another page. On that page you will find a listing of related pages.
When you are logged in you have an Edit icon/tab on every page. Your "My preferences" link will also give you the choice of having edit links for each section. These can be used to make a small edit or add a snippet to an existing page. You might also find it useful to set "Preview" as a default.
If you are interested in creating a whole page (or series of pages), you will find a short introduction to relevance of content and on the same page there are links to How-To pages for most common tasks.
Whatever happens, you are not alone. If you hit a problem don't be afraid to ask. Use "Discussion" pages for questions about the topics under discussion - they are usually picked up quite quickly. There is also a forum topic for questions about editing. Quick questions that don't need a lengthy answer can also be asked on Freenode IRC, channel #kde-www.
Above all, we want UserBase to be an enjoyable experience, both for readers and contributors.