A blog post is the primary type of post on the site. If you want to participate in the classroom activities you will need to know how to post a blog. In the drop down menu of "Write" you will see one section for blog entries. You can also get there by directly clicking on "write."
Here, you have a form to create a regular blog entry. You need to add a title at the top, and on the right you need to choose the proper classroom (if you are in more than one) and the proper tag.
Tags help keep the writing organized, and can be thought of as folders for storing different work. Generally, each assignment gets a different tag so everyone can find the responses to the specific assignments. Teachers can create new tags, and should with each new assignment.
Make sure to save your blog post.