In the menu, select assumptions/financing/cash at beginning. Then edit the value.
Note: This can be non-zero ONLY when the company has started prior to the year that you are asking Offtoa to model.
If you are modeling a brand new start up company, it will have zero cash at the beginning!
Related Questions:
How do I change the date the company starts (i.e., its founding date)?
How do I change the starting date you are asking to be modeled/displayed on all the reports?