Upon pressing "Generate Schedule", a side panel will open. Start by entering the amount financed (1), then all individual or periodic payments (2), and press "Generate Schedule" (3). Once you're happy with the schedule, press "Use Schedule" (4), and the full schedule (in green below), will be entered into the system.
Additionally, if the amount capitalised is different from the amount financed, you can adjust it in the field below the Payment schedule.
Finally, scroll down and edit the depreciation methods as you would for any other asset, and press "Save".
This will open the side panel, where you can specify whether the asset is a hire purchase (1), input the payment schedule (2), either manually (a) or using AssetAccountant™'s interest calculator (b) (See above for how to use the interest calculator).