Fall planting is always tough since the plant has no time to get established before winter. The best thing to do at this point is to feed them with Holly-Tone in the soil and get some Mir-Acid plant food. Dissolve the Mir-Acid in water as directed and wash that down over the leaves and stem. Mir-Acid can be absorbed through the leaves and stems for emergency feeding. Do this once a week for the next month or so. The Holly-tone is slower and will feed the azalea for the rest of the season. Use Holly-tone every spring from now on.