The reason we don’t provide information for dextrose on the label is that we only recommend the use of liquid malt extract for this particular kit, so dextrose is not a recommended option.
Using liquid malt extract will provide the optimum body and residual sweetness for the ‘juicy’ taste profile of this kit, whereas, use of dextrose will result in a lighter bodied, slightly drier beer.
You can still use dextrose at 1 kg (2.2 lb) if you don’t have the option of using Liquid Malt Extract, but the taste profile will not be as good (in our opinion at least).
Another option would be to use 1 kg (2.2 lb) of a light dried malt extract, which will be more in line with the Liquid Malt Extract (but again, not quite as good).