According to what I found on the internet, that's a fairly straightforward charger which should follow the generic instructions.
1. Plug in the charger.
2. Connect the charger to the battery (ie red to '+' and black to '-').
3. Select the charge rate (round button on the right side of the front). You can set it to the first setting which is auto.
4. The display should light up telling you something about the battery depending on the middle button I believe - ie battery voltage, capacity...
5. At least one of the 3 indicator lights below the display should light - ie the charge light. The battery reconditioning light may light depending on the what the charger detects.