I've watched the video on YouTube but thats for a tent with a loose ground sheet. I've got the zipped in groundsheet.
When I peg out the groundsheet I put pegs through the little eyelet type holes round the edge of the groundsheet. I then do the central pole and the a-frame, shut the door and do the guy ropes.
Now there are little fabric loops at the bottom of the walls on the outside which line up with the eyelets. I wasn't sure if these were only for when/if the walls are rolled up???? I did hook the loops under the pegs that had gone into the eyelets - was that wrong?