The toilet seat wobbles back and forth, how can I tighten it?

Hi!

I have been having the problem for a little while that the toilet seat is wobbling more and more. I have already watched videos on how to tighten it again, but with us the "mounting" to the toilet bowl is different from the videos. How can I best tighten it again?

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This concerns the screw on the left in the picture.

Thanks in advance for the help!

What does the screw connection look like from below?

Do you mean from behind/under the toilet?

Thank you for the tip, the mother on the other side had come loose... I could have pulled for a long time! Thank you for the tip! Now the lid is tight again