If you are using Prestashop as CMS, the first step is to activate the Carts Guru plugin in your Prestashop back office.
This is done in the “Modules and Service” tab of your back-office menu:
(Your back-office interface might be different from the one shown in the following images depending on the Prestashop version you are using)
Once you are in this section, you need to find and install the module. Be careful that the version is 2.0 and the logo is green, otherwise it means that the volume isn't loading successfully.
When the module is installed, you need to insert the configuration parameters (site_id and auth_token)
When the module is installed, you can try to access it again in "Module and Services". Check that the install button now contains the label "Configuration", not "Install"