How do I change my iPhone pass-code?

I have an iPhone 8 Plus and I have been using the same 4-digit pass-code for ages now, so I wanted to change it. I couldn’t immediately find the possibility in the Settings, so I looked it up online. It says to open Settings > Touch-ID and password but that section does not exist (anymore) when I open my settings. I wish I could include a screenshot to show you. Does anyone know how this is fixed? Thanks in advance!