I have domain with name.com. When I put the name in the blogger it says Another blog is already hosted at this address. I couldn't understand what is my problem? Screenshot Please help me.
Google has dynamic DNS servers, you should create CNAME record pointing www form to ghs.google.com and redirect 301 bajelpael to www. Unfortunately there is something wrong with redirections in name.com, so this is not working well with Blogspot. some more here in theory two CNAME records www and non www poiting to google should work, but blogspot refuses to merge them and you have the screen like yours.
Maybe you can ask for help from your domain registrar on how to point the domain to blogger. They should be able to help.