To force one or several products to appear first in a product list
To bring a product on top, you need to create first your Rule and connect it to the right widget (see topic 1 for support on this)
Bringing a product on top is defined by the right part of the edition or the Rule: the Effect. Indicate what product you want to put on top (for example: field: "id" and values with the id of the product, then select the effect "rank" and put the ranking position to 1. If your product was already in the result list (but not on top) that's enough, but if your product was not there, you must also select the check box "force include" to include it in the results. Otherwise, it will be pushed on top only if it was already part of the results and not otherwise.
Alternatively, you can simply include or exclude the product (instead of ranking it), Include just make sure it is part of the results, but doesn't affect its position and exclude removes it from the product results. Finally you can use the option "boost" if you want to promote it with a specific weight (see the weighting of your Scorers in your TPO WPO Strategy for more details about boost weights and the scoring formula).