Ok I give up (Millwall Profile)

I’m assuming you already have your profile which you set up on the OS?
If so, on the opening page of the app, bottom right hand corner, there is a little head. Click on that and the log in page opens up.
Right, stupid question I suppose but before I start, what on earth is OS?
 
I buy my st through the website but apparently I don't have an account. Can't be arsed fucking about with it or the app.

I'm sure anything of interest on there will be put on here by some busy techy ....
 
Linked my ticket account with the family mambers automatically attached. Scrolled down and then saw it defaults to them being able to buy on my account. The default should 'cant buy' on my account. Big error there.