AD9915 evaluation board controlled via SPI

Dear All,

I am trying to use AD9915 evaluation board for fast frequency, phase and amplitude modulation. The idea is to serial program 8 available profiles and then jump from one to another. If we will need more configurations available we want to reprogram profiles before ahead and jump from profile to another at a precise time. 

My concern is that I am new and could not understand or find some information from the Datasheet. I was able to control the DDS via USB following  Evaluation Board user guide.

Could you please explain me explicitly how can I set up the system and how can I verify that a simple profile 0 frequency is set to 100 MHz for example. I hope that this will be very useful to others as well as many students without a specific background are intended to use DDS and program them a lot. We are using 2.4 GHz external reference clock.

Several question that I already have:

1) As far as I understand Sync_CLK is not used in serial programming. Am I right?

2) How the Sync_CLK is obtained? When using GUI and controlling via USB the Sync_CLK is shown in a right top corner as 2.4 GHz and could not be changed. Reference clock is 2.4 GHz. However, I with a spectrum analyzer I measured it to be 300 MHz. If I would need to change Sync_CLK, is there a way to do it?

Thanks in advance