Here are the steps on how to use SDXL 1.0 with the Stable Diffusion WebUI:

    Go to the Stable Diffusion WebUI GitHub page and follow their instructions to install it (https://github.com/AUTOMATIC1111/stable-diffusion-webui)
    Download SDXL 1.0 via Hugging Face (https://huggingface.co/stabilityai/stable-diffusion-xl-base-1.0)
    Add the model into Stable Diffusion WebUI and select it from the top-left corner
    Enter your text prompt in the "Text" field
    Enter the width and height of the image you want to generate in the "Width" and "Height" fields
    Click on the "Generate" button

via https://www.ghacks.net/2023/07/27/how-to-use-sdxl-1-0-stability-ai/
— Permalink