Very sorry for the late reply.
I have been studying that FC trying to find where to wire everything up to and this one surprises me. With a Spektrum Sat, you will need the VCC (5v in this case. I always use a 3.3 port, but it seems this board doesn't have one and
@Admiral taught me something today! I didn't know they could go up to 9v!), ground and then you have the signal. VCC and ground are pretty self explanatory but the signal (usually gray wire, maybe yellow) needs to go to an RX port on the board. I'm only seeing one Rx port and that is where the GPS is wired into in your picture. Unless the SID for SBUS is UART3 or something, the RX6 is going to be your only option.
From there you will need to go into the config tab and set a serial rx to on, then you will need to go into the receiver tab and set it to spektrum 2048. I may have those backwards and if I do, it will turn off the serial rx when you save the file. Always double check all settings after saving.
This has to be the first board I have seen that doesn't have multiple UART ports on it and that doesn't have a 3.3 pad. Hope this helps and again, sorry for the late reply.