Google search , comfyui manager github, or go to https://github.com/Comfy-Org/ComfyUI-Manager
https://github.com/Comfy-Org/ComfyUI-Manager.git
And you MUST Make sure you put clone it in the correct directory which is on my computer
cd ~/ComfyUI/custom_nodes
and
git clone https://github.com/Comfy-Org/ComfyUI-Manager.git
When that is done go back to /ComfyUI dir and run. Include --enable-manager too
he didn't in the tutorial and the old manager won't appear without it
python main.py --enable-manager --enable-manager-legacy-ui --force-fp32
The old manager from --enable-maanger-legacy-ui looks like the one in this video