Here is the problem:
I want my UI to be “above” the hands, all I’ve seen is that you are supposed to use “Render mode: Screen Space - Overlay” but it doesnt help.
I would be so happy if someone could help me out 
Thanks in advance.
The hands are UI elements? If so, the UI elements are draw in the order they are in the hierarchy. Move the hands up or down (I can’t remember) to get them to draw under the thing at the bottom.
It’s not really clear what’s going on in your screenshot. Are the hands UI elements as well? If they are, make sure they are listed higher in the hierarchy (towards the top) so they get drawn first, and the HUD elements (being lower), will get drawn after.
There is some Z-index stuff you can mess with to work around this, but rearranging in the hierarchy is the simplest way.
Oh sorry, the hands are 2 spheres, 3d spheres. They have nothing with the canvas to do. THey are childrens to my Character Controller.
Can you take a screenshot showing the hierarchy window? Do you have any weird shaders or anything on the spheres that may be causing them to render other than the Unity default behavior?