To install Tapfiliate in your Lightspeed eCom shop, simply install the Tapfiliate through the Lightspeed eCom App store.
Do note, that by installing the App through the Lightspeed eCom shop App store, a new Tapfiliate account will be opened and billing will be done through Lightspeed.
Please remember to test a conversion before starting your program. This way you can verify that tracking has been set up correctly. You can create a test conversion by following the steps described here.