Ok.. This is a sort of follow up on another post. After working arround my newbiee experience , I confronted the following error

yum list all

then got back the following

Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again

This is the very first application that I am trying to intall with functionality from the GUI. Best said.. list the application in the Application menu. But not able to do this.. Any light as to what I am doing wrong? I