What you are seeing in the SNR really means no signal
so the simple questions first
1) Where are you in the World (so we know what Sat you should be using) snd are you set to the right one
2) What hardware are you using ( Dreamcatcher or older?)
3) please post a screenshot of the "tuner" in Skylark
4) are you inside or outside and Is there anything in the way of the satellite? ( trees , windows, flyscreens etc. etc.)
My advice for the first time user is to have the antenna OUTSIDE in a 100% clear area to get it going in the first instance. My personal experience was that a nearby sat TV receiver was causing so much noise that I had no signal until it was turned off, but I only found that because I took the outernet Rx away from where I had it in the first place.
Oh and BTW I have seen iphone apps that point 180 degrees wrong, so EXACTLY the wrong way LOL.. If you are in Aus ( by your avatar) you should be pointing roughly to the North