Sorry, apparently the wording is slightly confusing... but the process is basically covered in the example at the end of page 74.
If you look at the Maneuver tables on pages 62-63, each has a Cost (basically 1 point per maneuver). If the Maneuver is one normally available to the style, then the cost of adding it to the style is 1 DP (per rank already known), if it is not normally available, then the cost is 2 DP (per rank already known).
To learn a new maneuver, you first multiply that cost (1 DP or 2 DP, depending on whether the maneuver is normally learnable by the style or not) times the number of ranks you currently have (and note that you cannot have purchased any ranks at this level yet), and you pay THAT DP cost.
This means that you have now learned that maneuver. However, you are not done yet...
The next step is to take that cost (1 or 2 DP) and add it to the total style point value for your style. You then look on the Style DP Costs table and find the NEW DP cost for all future ranks that you want to purchase in the style.