If the person already has a City Blogs account, you can add them to your blog.
For a full breakdown of the roles please see the Edublogs guidance on roles.
If the people you want to add don't already have a City Blogs account, you can generate an invitation and email it to them. When they accept the invitation, their City Blogs account will be created and they will be added to your blog. They must have an IT account.
If you need to add a batch of users complete the batch create spreadsheet and log a request with the IT Self Service Portal.
Your blog Dashboard also displays recent comments. If you are viewing your blog, you can see a count of the number of comments for each post and selecting on the number of comments opens these for you to read.