Students can submit Kidblog posts as attachments to Google Classroom assignments.
1) Click the "chalkboard" icon at the top of the Kidblog post you wish to submit:
2) Choose your Google Account and authorize Kidblog to access Google Classroom:
3) Choose a class and assignment. Your current post will be attached. You may also choose to "turn in" the assignment to be graded at Google Classroom.
Notice: In order to submit a Kidblog post as a Google Classroom attachment, the assignment must have been created from Kidblog.
If you don't see an assignment in the list, it likely wasn't created from within Kidblog. See Creating a Google Classroom Assignment