[Unable to save edited RAW file]

I am new to Affinity although I used many Serif products in years gone by.

I have opened a Nikon NEF (i.e. RAW) file in Affinity Photo which automatically uses Develop mode. I have now edited the picture to the state that I require but cannot find a way of either saving it or exporting it. I have been told that I need to commit the picture first, then I should be able to save it, but I cannot find how to commit it either. From my viewpoint the help files in this respect are useless.

Er, help?