Please Help..

i am creating a basketball league from our country.. i seeked help from a friend to edit my roster because i dont have full version of the reditor.. he did well but forgot something.. he forgot to reset the roster before editing the roster.. now i cannot create other players because it has only a capacity of 150 in create-a-player.. i cannot delete the created player on d-league because it says the player was assigned to d-league so i cant delete it to free some space for my players.. how can i access that d-league? how can i delete the d-league created players on create-a-player to free some space for my players to be created? hope you can help me..