The adjusters are on the back of the headlamp and are usually a 5 or 6mm hex (Allen) key size. There are two of them, 1 for height and 1 for left/right aim. The best idea would be to ask a local garage/MOT station if they could check and adjust the lights for you as they'll have the beam setter/testing equipment to set them correctly.
Also, the thumbwheel adjuster you are using will lower the lights, not raise them, the higher the number you set them is an adjustment to compensate for weight in the boot so the lights will seem too low if it's on setting 3 or 4. The lights need to be set manually with the thumbwheel adjuster on zero.
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