Bojana - Are you using a "standard 101-Keyboard" (English)?  If so the square brackets are usually located just above the enter key to  the right of the letter P Key.
Forgive me if I'm wrong but I'm guessing that is not the case and that English is not your primary language.  Correct?

Yes, I am using Latin keyboard and my primary language is Serbian :) Thank you for the answer, I know for the English keyboard, I was just wondering where is the list of shortcuts for access.

You're right. I Google'd the Latin Serbian keyboard and it doesn't look like they give you a [ or ] character.

I would suggest using the ALT-key ASCII shortcut. Hold down the ALT key and on the numeric keypad type "091" for [ and "093" for ]

Are those brackets on the F and G key?

I'm not sure if it's the same keyboard you have, but online it looks like you can push control + F or control + menu + F to do [ and G for ]

Oh yeah... I missed those. I was so focused on the right side of the keyboard WHERE THEY BELONG.

Would there be the OSK (on screen keyboard) app, think it used to be in Accessories.

The AltGR key acts like a shift key or FN key on a laptop.  AltGR + F (in the original post )  produces the left square bracket,
I believe that what Bojana was asking was if this could be turned off (made permanent )  and I believe that the answer to that in my experience with dual language keyboards is no. in general. typically this is controlled by drivers for the keyboard at the Windows level.