In what way do you mean this, like how exaclty cant you edit your team, you unlock the character select screen in chapter 3.
The menu option for character select appears for me from the Castle area (not sure if this chap 3 so Im mentioning it). When I click on it I see the char select screen but all the options are empty and I have nothing to select too (unlike the one preview image). The game also gets softlocked and I have to refresh the page.