That is the stock ENO knot...no idea what it's called. Don't try to replicate it. Just thread your loop through the channel, and then back through itself to form a larkshead knot.
What kind of cinch buckles do you have?
If you have the kind from AHE you need to put the amsteel or whatever cordage you are using through the two buckles and then make the continuous loop. It is not recommended to larkshead a loop through the two buckles as it could affect their proper use.
Don't let life get in the way of living.
That's a pic from my ENO.
The pic is of Spyderline tied in a prussik knot on a cinch buckle, then the standing ends of the line are run through the hammock end channel and tied back onto itself via a bowline knot. Very secure.
Like the others say, tie the prussik first.
“I think that when the lies are all told and forgot the truth will be there yet. It dont move about from place to place and it dont change from time to time. You cant corrupt it any more than you can salt salt.” - Cormac McCarthy
Here is what the ENO knot looks like on the inside. Like others have said, I would not try to replicate it. There are other suitable knots without the complications of this one.
If you want to try..
start by forming two loops through the channel. ie..make 2 eyes/circles and tie the ends together.
The other piece is just knotting in the bight like a truckers hitch.