When you have saved a few different notes in your Dream (e.g. like you see in this image), before you write a query at the top query area, make sure to refresh the page first

Refreshing helps autosave the data so that you can refer to the notes when doing your query.

If you don’t do this, and you write a query at the top, you will get an answer from SIKE saying it does not know what you are referring to (if you wanted the query to refer to something new you put in those notes).