Go to Review Pops > Triggers > Where To Show > Product Page
Click Add Combo button:
Name this combo at first, and choose product(s) you want, then click Apply button:
Finally, do not forget to save the rule.
Later, when you setup Cart Page, please keep in mind to use this combo for utilizing profit, by clicking on option "Include products in related combo".
Should you need further support, please feel free to contact us via live chat in-app or email us at firstname.lastname@example.org