I clicked on sample prompt. Then had an idea of my own and used that, but page didn't show anything. Now I have used all 2 of my prompts and I can't even go bac

I clicked on sample prompt. Then had an idea of my own and used that, but page didn't show anything. Now I have used all 2 of my prompts and I can't even go back to see them anymore. There needs to be a history button or something.