how can I change the number of bullets? [closed]

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Styles and Formatting → List Styles → List x → Options tab:
You can select a "Character Style" for each level (or level 1–10).

Styles and Formatting → Character Styles → "Bullets" → right-click (context) → New...
Create a character style (e.g.) "Bullets_red":
Font Effects tab → Font color (e.g.) "Light red".

Select the new character style "Bullets_red" in "List Styles → List x → Options tab → Character Style" (here: only level 2).