Read the label. Most organic fertilizers have slow release nitrogen so all of it is not available at one time and depending on what the source is it needs to be broken down by soil organisms into a usable form.
The directions on the package says to apply as a band , 1 cup each side for a 5 foot row. Keep at least 3 inches from the stem.
For a single tomato, mix 3 tablespoons into the soil before planting.
If the fertilizer, any fertilizer is applied in a concentrated form, you will risk burning. Banding fertilizer lets the plant reach out to get the fertilizer and mixing the fertilizer in distributes the fertilizer more evenly and dilutes the fertilizer so it should not be so concentrated that it can burn the plants.