How can I manually place an app within my homepage code?

Hi,

I wanted to add an app to my site that offers to show testimonials in a slider (Testimonials Slider & Reviews). After installing the app I can choose from different options on how and where to place it. (See printscreen below)

I would like to place it manually, but it’s not clear to me where I should place it in the code. Can somebody help me with this? I need to find the code file for the homepage, which I think I found but when I tried adding the code in between it gave an error.

This is the code the app gave me:

I want it on the homepage, underneath the text box including the button ‘shop alarmsprays’. (See printscreen below):

(The theme I am using is craft.)

Thank you!