To be very clear about this, you should not add unprocessed feces to your garden under any circumstance. You will get sick, some people might die.

Manure should be mixed with a ratio of 5% to 15% manure to 85% to 95% soil depending on the clay composition of the soil, more clay means higher ratio of manure, and you should increase the ratio by 5% for crops like tomatoes and cucumbers or decrease down to 2% to 5% for crops such as lettuce or herbs. These percentages are by weight, not by volume.

Once mixed, or actually even long before mixing, the feces needs to compost for at least 6 months in warm moist weather, preferably several years. This allows the bacteria cultures (and bugs) to properly decompose the matter.