Yes, you absolutely can. Just click on the fund name (the existing one) that reflects on your Invest the Change home page, and then select any other fund of your choice (you will see options that allow a minimum investment of Rs. 100 to Rs. 500).
Note: If there is already an investment that’s in progress, then it will go into the fund that was chosen at the time when the investment went in progress. All future investments will be in the new fund that you have selected.