how to add pay with like plugin into specific places

Hi there,
i am creating a sales page. It is just one page. In the page i have 5 different products. For each product i want to give demo version to my customers. To do that i want to use pay with like plugin.

But i don't know how to add that plugin just below my products.

is there any way to do that..

[i hope i could explain what i mean. i you could not understand please let me know. i will try again. English is not my main language. regards]