When you download and install “Compare Addon ” a new section will be added to the Addons tab of Listdom -> Settings and you can configure this addon.
The first step is creating a page and “listdom-compare” short-code to that. Then you need to select that page in the “Compare Page” field.
After that you can set which default fields should be in the compare table.
Also you can set up which custom field should be in the compare table.
Another feature that Compare Addon provides is the “(Listdom) Compare Button” fetuare which shows a button to link to the compare page that you have already created.