Hi,
If you go to the bottom of your post and look next to the section where you put tags, you will see a button that says "Advanced". Click on that button and a menu will pop up. You will see, add beneficiaries. Click on that and you will see the option to add beneficiaries. Be very careful about putting the correct name in, otherwise the 20% will go to the wrong place. Then click "Save" at the bottom of that menu.

Let me know if you have any more questions. I'm not very good at navigating the blockchain, but I have this step down pat :)

Have fun this week. I have not started my collage yet. Christmas is distracting, but I'll get to it.

Good luck!