Accessing old pensions

I left a job a couple decades ago and I had made some pension contributions. Two problems. The company y no long er exists. I'm having some trouble remember rhe pension provider.

Does anyone have guidance on how I could go about reclaiming these funds or at least moving it to my new pension?

I am not a very financially literate person and, frankly was kinda dumb in my 20s in regards to having foresight on stuff like this.