1. click on the rows to show the transformation panel
2. multiply the selected row by any rational number by typing into the two text boxes
3. drag the transformed row to any other row on the matrix to add them to that row or click 'Repaste' to replace the original row to the new form
4. drag the yellow knobs on the left to each other to switch two rows
5. Continue until the left matrix look like the identity matrix, then the right matrix will be the inverse of the original matrix