How to update reading challenge, need assistance.

My reading challenge bar shows 34 books out of the 300 goal for 2015.  I actually have many more. When I've attempted to edit it, it takes me to a page to update the goal of 300, not the books read.

 

This photo shows my goodreads challenge bar.

 

 

Please help me learn how to update my books read on booklikes. Any suggestions? Thank you.