So "existing members" doesnt exist or I havent been able to find it so I simply clicked "add member" and then put POL as the name, ID as the Player Online ID, and ABCD1234 as the password. When I clicked log in it did not work. So then I tried doing a random name, POLID for the player online username, and the same password, and that did not work either. What am I doing wrong?

ok I discovered that that isnt the problem, what is is that even tho I installed Final Fantasy 11, it isnt showing up when I click check files

You need to properly copy the update files for it to show up.