Yes, there are two easy ways get a barcode number into asset.guru.
Firstly - the fastest way is via the desktop (browser based) bulk asset upload process. You'll see a column for Serial numbers and Barcodes on the CSV template provided.
Secondly - use your iPhone to scan the barcode either as part of an audit of existing assets in Asset.Guru, or when adding an asset for the first time from the iPhone app. The iPhone app can be downloaded from the Apple App Store by searching for "Asset Guru". There is no charge to use the Asset Guru iPhone application for customers and trial users of Asset.Guru.