you have to go into your blogger dashboard and change the settings for your blog.
choose the publishing tab.
towards the top you need to select either the ftp or sftp. (ftp will be fine and is what I use)
then fill in the login info for your hosting account's ftp.
then just setup the directories, etc as you want them. (sounds like you want the root html directory for your website)
that should get you going.
it's just a matter of telling the settings of your blogger blog to use YOUR hosting ftp instead of their blogspot hosting.