Shader Graph and nodes

Hi, I’m relatively new to Unity and currently I am working on the Shader Graph for my current project. I have my shader created and working, but multiplying it over my material isn’t going so smoothly. Part of this is because my variable nodes aren’t showing up in my surface inputs section and i cannot input my material directly into the “Main Texture” variable from there. However, in node settings, I have inputted my UV map for my material in there but it is still not showing up on my model in the scene. I hope I explained it well enough, but if i could receive any tips and help that would be great, thanks.
If it helps i have been following a combination of these two tutorials: full video of this one: https://youtu.be/MXZ578OXOog?si=dJXen1YuMmj9lviF
and last third of this one: https://youtu.be/lYGWP0UpiO0?si=arug7b289ucPISHg

It looks like you haven’t saved your graph yet. If you don’t save it, none of your node updates (like adding properties) will show up in the editor.