Small typos are relatively easy to correct, assuming you have the right access. Most people should be standard users and will therefore only have access to personal and group pages. Administrators have access to the whole site.
All you have to do is log on (if you aren't already) and go to the file manager. Navigate to the correct page (eg the sponsor page is in /sponsors/sponsor.php), and click on the file name. This takes you to a page with a form that lets you change things like the title, description etc.
Below all of that is a big box with the page source code in it. All you have to do is find in the box where it says "looks", change it to "look" (if that's the typo) and hit save. Obviously, if the text is towards the bottom of the page, it'll be towards the bottom of the box.
If you don't know about HTML, then these are the only changes that you should make in this box. If you know how to write HTML source (there's plenty of information on the internet about it, and is very easy to do), then you can actually use this box to rewrite the whole page (should you want to).