Login to your Confluence instance and naviagte to the “Find new Add-Ons” page:
Search for “HTML and AUI Toolkit for Confluence”.
Select the “Install” button next to it.
After that installation, you are done. There is no more configuration to do.
How to enable macros after installation
Macros can be easily enabled or disabled after the plugin installation in the Add-on Manager of Confluence.
Navigate to the Conflunce Add-on Manager and scroll down to the HTML Toolkit for Confluence plugin entry. Click the title bar.
Click on the expand icon of the modules for this plugin.
You will see the list of available modules in the plugin. Some of them will be disabled after the installtion.
Move your mouse over the red-colored Disabled text. It will turn into a button saying “Enable”.
Done. The module is now enabled and available to your users.