Scroll lock is an obscure key that has mostly outlived its usefulness. Size-constrained laptops often omit the key, layering it with some other key combination that you generate by pressing the FN key plus a second key that varies. Here’s how to get scroll lock on a laptop when your keyboard doesn’t have the key.
Usually to get scroll lock to toggle, use the FN key and a combination of a second key, often C, K, S, or even F12. You can also use the Windows on screen keyboard.