The Wix system is 'massive' so I can only give you the basic steps you will need to fill in the details.
1. create a new page called reviews
2. click the add app button
3. search for Customer Review
4. select our app
5. drag / drop and stretch the app so it feels the page
6. go into your email find some reviews from people and put them in there
7. delete the app from your front page
Here are some videos with more details.
Have reviews on your website in just a few minutes.
Top Reasons People Upgrade
How To Configure Recorded Demo
How To Manage Reviews
How to Edit A Review