Need help with pattern instructions

Hi I am trying to work out some pattern instructions but am getting in a muddle.
The pattern is Margaret Walker’s Lined Kep.

I have attached the pattern instructions I don’t understand… not sure where to place the marker or do Round 1 and Round 2 on straight needles.

I don’t understand where to put marker and then how or where to slip marker. I have hilighted the bits I am getting in a muddle with.
Any help appreciated.

Very good looking hat.

Are you knitting the lining? it looks like it has an opening and so may be knit back and forth as in the 9th project photo here.