A number of different 'Blocks' can be added to the right column of any page in Moodle.
1. To add a 'block', the first thing you need make sure is that your editing is turned on (via the silver cog wheel top right).
2. To find the 'Add a block' link, make sure your left hand navigation drawer is open using the icon.
Then Scroll to the bottom of the drawer and you'll then see the option to 'Add a block'.
3. Choose the required 'block' from the list.
4. You'll then see the 'block' appear on the right hand side of your Moodle space.