After DoS Favorably recommends u to USCIS, it sends a copy of it stating that these reco. hav been sent to USCIS for further action (DoS sends this mail using the same stamped envelope u sent with DS 3035 and fee etc). At this time u dont hav to take any action, u just hav to wait. USCIS approves or disapproves the recommendations and notifies u as soon as it is done.