Is it possible to disable comments on a blog post you made on UCP when you are not an Admin or moderator on the wiki? If so, how?
Yes, it is on the bottom of the editing area when you edit the blog.
Just like when you edit any other page, at the bottom should be a place to write an edit summary, mark the edit as minor, preview the change, save the change, etc. There should be a checkbox there for comments.
What do you think?