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Down to basics, your camera (all cameras) will try to give an exposure that gives a middle grey (or color).... so a 'straight' picture of a field of snow or a dark black night would both be grey. So you need to think about what part of a scene should be midtone, or the 'middle exposure'. I would suspect in this case it's not the direct view of the flame from the burners but somewhere inside the balloon, near the bottom. That is what should be measured by your camera's meter.
I don't know the Scene Modes of your camera but I'd think one of them might bring you close to a good exposure.
Otherwise...... your camera has an 'exposure lock' (or AE lock) - so the camera would then be pointed at that area (with as narrow an exposure mode as possible, like 'spot'), then you'd press and hold the AE Lock, recompose your shot and then press the shutter release. If that's successful, take note of the Aperture and Shutter speed it used.... you could then, with the use of Exposure Compensation, get that same setting from the subsequent pictures without the AE Lock technique. If the correct setting cannot be achieved with Exposure Compensation (quite possible, as your camera will only handle +/- 2 stops), you might like to switch to manual to get the successful setting back.
Even with a correct exposure, I suspect that the shutter speed may be quite slow.... in which case I'd recommend using a tripod rather than raising the ISO - all that night sky can appear very 'noisy' with a small camera sensor with higher ISO.
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