Fixed Button

Hi i need a solution for a fixed button on the side edge. i just want to be able to link it. I have not found a solution in gridbox.
There are the social media plugins that also attach to the page but I can't insert my own content. I will add a screenshot (example page).

Next question:
I would like to add TikTok and other social media to the social media icons in gridbox. How does that work?

Best regards

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