I'm trying to add brackets into my graph, but I don't know how.
You could try downloading an image of the bracket you want from the internet, and then inserting an image into your Geogebra sheet which you can then rotate and resize as necessary.
May be use it as background picture.
What I am doing (sorry this is so late) is making the graph in Geogebra, then copying it and pasting it in Word, then saving as image, then reinserting it where I'd like it.
In the Word document, I inserted the .png from Export Image option in GGB (or use the built-in Snipping Tool in Windows). Then I used Word to add all the blanks and curly braces. Then I selected all the objects and grouped them and CUT them (Ctrl + X) and used Paste Special (Alt + E, S) and chose PNG. Then I right-clicked on the pasted .png and selected Save as picture and was able to create the attached .png. :) HTH
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