It’s a pain in the @rse, I can tell you that from recent bitter experience! If you don’t need to, don’t do it. If you have no alternative, there is one obvious to the right which is quite straightforward, one 10mm nut to come off then a second 10mm nut which brings out the whole securing rod.
The second securing point is on the left, take off the obvious visible 10mm nut and beneath that is a 5mm (or possibly 6mm) hex head nut which is securing a fuel pipe onto the same rod above. Once you have this off, you might get a glimpse of the second 10mm bolt which you need to remove. Extremely tight working room and very fiddly, but with the right tools it can be done if you have the patience of a saint. Fitting is the reverse, obviously, but you might want to check the gasket on the flange joint for damage.
One useful/essential tip, place a towel/cloth beneath the flange to catch any fittings that inevitably drop down and are impossible to recover without a magnet tool.
Good luck, you may wish you’d never touched it in the first place. I did. Twice!