I can help you with mapping your columns to import a CSV file.
To import a .csv file you must use either a 3-column or 4-column format. A 3-column format must have a Date, a Description and the Amount of the transaction. A 4-column has a Date column, a Description column, and both a Credit and a Debit column.
On the Map CSV columns window, you'll have to match the QuickBooks Online fields (Date, Description and Amount) to your statement fields (the columns in your CSV file).