You submit a new sale / offer from the "Submit" tab. If this sale / offer is for your business then the only information that you need to enteris to describe that sale / offer. But, if it is for any other business, then you need to also provider information about that business.
In the latter case, your current location must be determined. Therefore, the "Location Services" should be enabled, and the device should be connected to the Internet. Once the app had acquired your location, it will try to convert that to an address.
You submit your sale / offer by clicking on the "Submit" button. Please wait for a couple of seconds to receive the responce of acceptance from the server. If something went wrong, you will receive an error message.