Instructions for Authors can be found on the website of each journal. Click on "Journal Information" in the top banner beside the journal name and then choose "Author Information" from the drop down menu (see below).
Authors can access a full-length submission preparation checklist here: Submitting Your Manuscript to JMIR Publications: A Guide for Authors. The submission preparation checklist is primarily applicable to article types that contain original research data.
Visit the JMIR Publications Author Hub and Knowledge Base for more information for authors.