How to enable gpu

I’m new to local llm. I’ve installed on windows 11 without docker llama3.3, OpenWebUI and CUDA but when I ask something to llama it uses the cpu and not the gpu. How can I force llama to use the gpu? Is there a program that I must install? Is there a setting that I have to switch in OpenWebUI? I am willing to uninstall everything and install docker. Pc: 7800x3d, 32gb 6.4Ghz, 4080s 16gb