Those blocks don’t make sense by themselves. Please post an updated link to your project.
You don’t need to use stored variables. You can save the new ideas in Firebase using cloud variables and then populate the List Viewer from Firebase data. Right now, you’re storing a single text input value in a Firebase bucket. That works but it’s only one value. If you want users to be able to add a bunch of different ideas, you have to learn how to use cloud variable paths with Firebase.
This tutorial shows some of these concepts: