Well I guess i'm not the only one to have this problem.
I play for 2 seasons so I'm not really a beginner, i've tried to adapt myself but i definitely cannot and i still make mistakes clicking on the wrong button.
I think BuzzerBeater is still a young game and this sort of changes can be done now, I totaly agree that you cannot do this sort of changes on the 10th season but I guess it will be better to have this button there for the next seasons and the managers who's gonna register a new team.
Maybe the reset button can be placed on the top of the lineup window to avoid mistakes by "old managers" and be able to reset team before doing it instead of after like it's today.
I simply tell that this button place is unlogical and not well placed, I don't say that because I often do mistakes.