You cant load xls data through TOAD. You have 3 options
1) save the file as csv and use sqlloader
2) write an excel VBA macro (using the Oracle OLEDB driver) to go through each cell in the sheet and insert it into the oracle table.
3) find a comercial app to do it
4) write an excel macro to convert each row in the sheet into an insert statement which you the copy into TOAD and execute