A Glow WordPress e-Portfolio blog is just a normal blog with the e-portfolio plugin activated.
When creating a new blog you can automatically activate this by selecting e-portfolio as a blog type.
NB. one way to get a unique site name is to use the pupils glow username.
To get to the create a blog screen you need to click Create a Blog when logged into your Local Authority Home page (You reach this from the blog time on your RM Unify Launchpad).
More details on the Creating a Blog page
You will be taken to the page to create a new blog:
Make sure you choose ePortfolio from site type. This will automatically activate the plugin and add the profile widget to the sidebar of your blog.