Whenever a chapter completes it unlocks the blocks for the next chapter for you. If you can't find the code blocks you are looking for, then you have not completed the previous chapter correctly π.
Two things might be happening:
If the chapter hasn't quite ticked off (you can see in the top right) check the hints / follow the article attached. This will show the blocks you need, but faded out (as they've for the "next" chapter).
If you can't see the blocks full stop, that means your variables might be missing or named slightly wrong. The editor is very particular with names, so make sure they're spelt exactly right! π
ο»ΏThe following guide can explain how to resolve these problems in-depth πͺ.
Of course, we are also happy to take a look at your code, but our experts may take some time getting back to you. Please let us know the course name and chapter and we will take a look. Otherwise feel free to use the skip button to progress to the next chapter π.