We have several resources available for you.
If you log into your website dashboard, you should see a section called "Your Website Manual". This contains written documentation and a large number of short videos which detail how to use the common WordPress functions.
If you want more in-depth information there is a comprehensive guide available for download here http://www.hypercube.co.nz/free-resources/
Depending on your website, there may be some theme-specific functionality which isn't covered in these guides. In that case you will probably need to contact us for assistance.