How the heck do I attach this bipod??

[Luna]

Hello!
My wife just surprised me with my first rifle, an AR15 – I am stoked! She also purchased a bipod and red dot. I understand how to attach the sight, but for the life of me I can’t figure out how to attach the bipod. I’m starting to wonder if it’s compatible with the gun she bought. Half the problem is I don’t know what all of the parts are called, so I’m having a hard time looking up information online.
Here is the gun she bought: [https://www.cdnnsports.com/radical-firearms-rf15-5-56-nato.html](https://www.cdnnsports.com/radical-firearms-rf15-5-56-nato.html)
And here is the bipod: [https://www.cdnnsports.com/bipod-8-5-11-quick-detach.html](https://www.cdnnsports.com/bipod-8-5-11-quick-detach.html)
I also took closeup pictures of the pieces that came with the bipod and the lower portion of the gun.
Thanks for your help!
https://preview.redd.it/rtfhh734n5341.jpg?width=4032&format=pjpg&auto=webp&s=892ab5290c227242a77f78d50344b0762e8038da
https://preview.redd.it/l9jmqg34n5341.jpg?width=4032&format=pjpg&auto=webp&s=f2fcf32ef76478bc377c33f070008ace215684df