The resulting model has many graphs, but the one it generally shows you first is the TFM one. Its basically a measurement of the subs performance, and the figure generally quoted is the one where the horizontal -3 line is. The lower the frequency here is a bit of a guide as to how low your sub will go, but how that translates into real world terms depends on the type of sub your building, and how much performance your driver is actually capable of.
The ones to read that will mean more to you are the SPL graphs (how loud you can expect it to go) and the cone excursion one, which will indicate the stress on your driver for any given amount of input. You can change the graph type in the top let drop down selection button on the graph.
In respect of the power your sub takes, there are two ways to read it. One is the wattage your driver (the actual speaker) can handle and one is the power your sub can take before damaging the driver. Your driver is rated at 200 watts, so the voice coils thermal handling capabilities max out there. It can probably handle a little more but its a good figure to work to. Thats the first way to read it. Now the second way is to look at the reaction of the driver for a given input. Once your sub is built, the larger the cabinet is past optimum size the less power the driver will need to reach max excursion. Increasing the cabinet size like this will result the built sub actually requiring less power to max it out.
We dont know anything about your sub really, other than the driver. What kind of sub are you building, sealed of ported etc, and what do you intend to power it with. Also, for help interpreting the graphs, it will be easier if you post an image of the graph you need help with and we take it from there, that we you dont have to read loads of info and try relate it to stuff you have to try imagine.