Directions are written with understanding that knitter has a basic knowledge of their machine. Cast on/off and cinching or mattress stitch on ends.
You can use a metal or foam wreath form.
There's no way to thread wreath over a metal frame, just fold piece over frame, secure as many times as needed by wrapping yarn around and tying a double knot. Fluff up between wraps.
With a foam wreath, make a slice on form and thread knitted wreath over it, either cinch ends closed or mattress stitch ends together. Then do your yarn wraps to fluff it up to look like a pretty wreath!

I used a metal wreath from I ordered from Temu. I'm pretty sure you can get them for a reasonable price at any dollar type store. I priced foam wreath forms on a couple of sites and they're more costly.