Hi Iyarodi. Thanks for your interest. Since this is a online community, there is no formal staff to provide services. You should start with the WELCOME CENTER (under the HOME tab), and you may also find some orientation under the ABOUT tab, and click on the FAQs there.
Otherwise, hopefully its somewhat self explanatory if you look at the drop down menus or read the commentary above each section on the home page. Hopefully you'll find some content that aligns with your interests.
Curious as to why you titled your request for a tour as you did?... "The human brain,parts and functions"....?