Google Analytics integration with Booking Engine

Walk me through the process of integrating Google Analytics with a hotel website (Wix) & booking engine (SiteMinder). I want to do this myself but want someone to go through the process with me via Team Viewer or similar. This will require the editing of code. Here is a link relating to what needs to be done https://help.siteminder.com/s/article/Booking-Engine-Set-up-Google-Analytics-to-track-your-Booking-Engine-conversion?language=en_US I have already done most of what is required.