Easyblogging setting up teacher and pupil views

I am using Easyblogging for my school blogs. I want to set up Teacher with Menu items [Dashboard, New Post, Posts, New Page, Page, Comments and Themes] and Pupil only with [New Posts, Post and Comments].

I have selected the items I wanted in ‘Menu items’ section of the plugin and then clicked Contriuter and above. Then I clicked what I wanted for the Teacher and clicked Editor and above. However, when logged in as a teacher, themes do not appear and when going to the site directly [domainname.com/wp-admin/themes.php] it says You do not have sufficient permissions to access this page. How do I change this