To add or alter the contents of a course, including adding activities or resources, a teacher must turn editing on. To do this, use the “Turn editing on” button located either at the top right of any course page when you’re logged in.
After editing is turned on, additional buttons will be noted in the course sections in the left part of the screen.
The double-arrow icon next to each section/assignment/resource etc. can be used to move the section/assignment/resource to a different position in the course. The “Edit” button reveals a drop-down list of options that let you hide, delete, highlight, or edit the content of a topic.
To make sure your course is visible to students, check out this post. The link in the lower right allows you to add an activity or resource.