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You need to know the phone number of the dongle (SIM card actually) and then you can recharge via the website.
Jupiter is correct ,you need the phone number.
If the device hasn't been recharged within 6 month's of the expiry date of the last recharge, the SIM should have automatically been deactivated....which means that you can't put a recharge on.
Has your friend told you what amounts you can recharge, and how much Data you get for each particular amount?
Each Pre-Paid mobile broadband plan has different $ amounts of recharge, included Data allowance per recharge and expiry day's.