Step 1: When logged in the website that you are working on click onto the Dashboard button which will be on the top website in the header.
Step 2: The dashboard will open up and you will see various settings for your website.
Step 3: Look at the bottom of the dashboard in the left hand corner.
Step 4: Click on "Extend concrete5".
step 5: You will be taken to a page that says "Add Functionality".
step 6: Scroll down until you see that Add-on you would like to add.
step 7: Once you have found the Add-on click download.
step 8: Then click install.
Step 9: When you are back in your website you will see the new Add-on in your Add-on menu list.