Check if your circulating pump is working, generally located in the hotpress, check your pipe thermostat, turn it down low when you have a good fire...after an hour or two and you should hear it come on, then adjust to 55 degrees and leave it there
By messing with the valves you could have caused the system to unbalance, go back and undo what you did, if you can't remember close the valve on the left to about one full turn, same on the right hand side.
Once done, pump working and fire on for a few hours it should be fine.
You may then need to bleed the radiators, there is a bleed nipple on each radiator, you can pick up a key to open the valve for a couple of Euro.