Change the text inside the title and content attributes to your own texts. If you want to keep one panel opened by default add a state=”active” attribute right after the title attribute:

[collapsibles]
    [collapse title="Title 1" state="active"]
        content
    [/collapse]
    [collapse title="Title 2"]
        content
    [/collapse]
    [collapse title="Title 3"]
        content
    [/collapse]
[/collapsibles]