mapping cname to my custom domain name results in posts with cname only

I have a custom domain yourtechchick.com hosted with openshift. I have mapped Cname your-techchick.rhcloud.com to http://ift.tt/1hm4ehL and it seems to work. But, When I click on posts, It leads to url with http://ift.tt/1LtH4nO . I want it to be http://ift.tt/1hm4ehT. How do I fix this?

My permalink shows your-techchick.rhcloud.com option only. Is it possible to fix this with wordpress url and site url thing?

Also, I would like to know in detail the difference between wordpress url and site url.

I somewhere read this is where I need to change, if yes, which amongst these needs to be changed to http://ift.tt/1hm4ehL from http://ift.tt/1LtH6vO.

and In case I mess up these settings, which file will I need to reupload through ftp client in wordpress directory?

via Chebli Mohamed