Randomisation of Attributes

Hello, my question is regarding randomization of attributes order. I know that there is a tutorial on it , but my doubt is with understanding what they meant in the steps in real terms, can someone help me with it ? I have uploaded the steps and highlighted the parts I did not understand how to actually put in Survey engine, for example first how to store it in derived value, and next if I add textfield (blue colour) and put that command just before the choice tasks begin , then nothing changes and rather a textbox full of codes are shown in preview. Kindly help me with it.