@gabriellecastillon
If the rows are consecutive:
Click the row number of the first row that you want to select.
Scroll down, then hold down Shift while you click the row number of the last row that you want to select.
If you want to select individual rows:
Click the row number of the first row that you want to select.
Hold down the left Ctrl key while you click the row numbers of other rows that you want to select.
Release the Ctrl key when you're done.
