Facebook account is locked, and I cannot confirm my identity

Hi,

I’ve been trying to log onto Facebook for a while now, because there is some information on my page that I really need to change. I think I tried too many passwords, cause now my account has been locked. It told me to log in on another device, but I have no idea which one they are talking about, and I tried sending my friends the link to receive codes but when I enter them it says they are invalid! I don’t know what to do anymore at this point.. Does anyone know what I can do and if there is any way to contact Facebook?