Assuming you have already followed the Manually create a new claim guide you will be presented with a screen similar to the below screenshot with a receipt preview box, currently this is set to No receipt selected.
You can change this by tapping on No receipt if you have no receipts, or add if you do have receipts for this claim.
Tapping on add will send you to the Available receipts page, where you can select an existing receipt you have uploaded, or you can use the camera or gallery buttons to capture or upload a new receipt. Selecting a receipt using this option will return you to the screen.
Tapping on No receipt will give you a few drop down options to select a reason for why there is no receipt.
When selecting a direct mileage entry category, you will be presented with a distance field, you may see the vehicle field if you have more than one available vehicle. Simply enter in the distance you travelled in miles.
Once you are happy with the information you have entered you can then tap save.