accounts journal to correct messed account

Yesterday something happened, either i deleated the right standing balance or something. 

i called quick books online for a chat but they started me off with a journal, then he ended and left the call.

i know have error messages and my bank is completely out.

so we started qb in sept but entered older stuff from 2020. the ceo reconciled and gave me a starting balance. i did bank rec for sept and oct 2021 but cannot with nov as error and i cannot fix it. dont know where to look to see or am unable to go back in account history as no visiable error???

i need help