hello gog im doing tutual on witcher 3 ok im trying throw a bomb it says use middle mouse button wich is mouse wheel soo I do it nothing happens?help please

I don't remember if you have to equip bombs in the tutorial. If the bomb isn't shown on the bottom left of the GUI, hit tab and select the bomb.

I think it first has you throw a bomb at Vesemir by clicking the mouse wheel. Then, you need to go to a specific spot and click and hold the mouse wheel to aim the second bomb.

If none of this works, try going into options and remapping the bomb key.

Had the same problem. I had to remap the middle mouse button in the options, I now use items with the V key.

This might be a stupid question, but are you scrolling your mouse wheel or actually 'clicking' it – that is, pressing down on it?

If yes, then try what the guys above me suggested:

1) Remember to actually select the bomb as your active Quick Access item (press TAB).
2) Remap your Quick Access key to something else. I use the 'back' button on the side of my mouse.