It's no problem :) 

Barcodes can only be 6, 12, or 13 digits. However, you can:

1. Type in the numbers you have & enter zeros until you get to 12 digits.
    E.g. 123400000000

Or, 

2. If there is no barcode, just type 12 zeros where it asks for a barcode.
    E.g. 000000000000

Kindly continue filling in the rest of the information, as well as submitting a crystal clear photo that shows the ingredients !

At the bottom, we have attached an example of an entry for you!