I've been using this recipe for body deodorant for several years now. To apply, I get a small glob on my finger, and if needed, wait till it melts a little to help distribute it.
1/2 cup baking soda
1/2 cup cornstarch or arrowroot powder
5 Tbsp coconut oil, melted
10 drops essential oils (optional)
Mix all ingredients in a small bowl until smooth. Store in a glass jar or other convenient container.