Which bit, is it that you don't know how start ?. It's hard to explain simply because there is no way of knowing how much you know. In this case have you a basic knowledge of using a PC ?.
1 Can you connect a usb device to a PC, can you format it. Having done this can you copy a file to it. Can you then rename the file?
Next question is clearly yes
Can you log into a website using a web browswer, If you can't you won't be here.
The custom firmware creates in effect a website that only exists on your Foxsat-hdr (clever ain't it).
When the foxsat is on you log onto it exactly the same as you did to get here.
Once logged in you get all the extras as already discussed, and loads of others.
Forums like this exist to help, trouble is with the best will in the world any poster tends to assume that a level of experience that the poster may not have.
I suspect you need help to know where to start. Can you answer yes to all in 1 ?