Someone posting pics/vids os my kids

Hi!

I'm not on the platform and one of my friends found a lot of pictures and videos of my daughter on Tiktok.

The gf of my ex-husband is posting a lot because she tries to be a "creator". My kid is autistic and asked repeatedly to not be on internet. My ex has lost custody on my kids because he beat them up.

He's telling everyone that my daughter is his girlfriends child or even that he has custody. (He only sees her 4 days a month)

The account is set with her name and my daughter's full name and my kid is barely dressed (bikini). It's easy to find where my kid lives or goes to school.

How can I proceed to ask TikTok to delete those images?