hi, noob here.

I applied for the subscription to hackthebox because I was informed that you can have access to retired machines as well as walk-throughs. My question is where are the walk-throughs located?

Or is it a write up that I should be reviewing?

Look at ippsec on you tube, has videos for lots of the retired machines all up there.

you can select retired machines from the dashboard, in left menu you have Labs → Machines, when you select machines at the middle of the page you can found Retired Machines option.