To insert a copy of an existing module into another page navigate to the page you wish to insert the module into.

From the module control panel select "Add Existing Module" and wait for your page to refresh until you see the "Page:" <-- select page --> drop down.

From the Select A Page drop down select the page you wish to copy the module from.

Your page will refresh again and now the "Module:" drop down will populate itself with all of the modules titles from the "Page" you select in the previous step.

Select the module you want and insert it as you would any other new module on the site.

IMPORTANT: This process makes a direct copy of the original module! Any change you make in either location will change BOTH instances of the module. You can however delete either module without impacting the original or the copy.