The Permission Settings for blogger can be found within the Settings tab. Let's have a glimpse on it.
Blog Authors: You can add authors for your blogspot blog in this setting. Click “ADD AUTHORS” and invite him/her by typing in the authors email. The author will receive an email about the invitation with a confirmation link.
Blog Readers: Here you can set the readers for your blog. If you want your blog to be publicly readable then select “Anybody”, “Only people I choose” is for selected members and if you want your blog to be readable only by you and your blog authors and no one can visit your blog then select “Only blog authors”.