GoTo use /blog/ as base of your posts you are supposed to use the Category Base option in your permalink settings.
Go to Optional and change the category base forenter "blog" into the blog links.Category Base
Go to permalink settings and change the category base for the blog links.
To use /blog/ as base of your posts you are supposed to use the Category Base option in your permalink settings.
Go to Optional and enter "blog" into the Category Base