pressure low on boiler

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Sorry if this sounds really stupid and written in plain stupid language but i hope to get some help here. Also im pretty new when it comes to boiler/heating.
Im lookin for probably a simple advice but i cant seem to get it anywhere. Tried googling for a manual but that seemed impossible.
Boiler is Ariston mircrogenus 23 MFFI
The pressure is low (as i can see that on the bar meter)
Its nearly dropped onto the red part (< 0.5 bar). Now a plumber once showed me how to up the pressure but that was 4 years ago and i honestly forgot.

I opened up the controls beneath the boiler. There are 3 valves at the upper part (with golden/metal knobs) and 6 smaller valves (screws?) at the bottom. If i remembered correct it was something with the upper right valve but i turned it a quater (max) to the right but boiler stays at 0.5 bar.
Am i overlooking something? Any other valves i need to open? Any help would be greatly apperciated!

edit i just read the faq/tips and i found the filling loop (silver flexible cable). It connects to the upper valves. Looks like this:

1---2 3
? ?

1 2 and 3 are the valves with copper/metal screws in front
--- is the filling loop (connecting valve 1 and 2)
? are blue switches below the valves; which i can turn to open or close. I tried opening both blue switches but still nothing happend.

Im feeling its something really simple but i just cant find it.
 
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Looks like this:1---2 3 ? ?
1 2 and 3 are the valves with copper/metal screws in front
--- is the filling loop (connecting valve 1 and 2)
?
That doesn't make a lot of sense, but it sounds like the valves at either end if the filling loop are operated by the screwdriver slots. this is explained in the FAQs. One valve will have two screwdriver slots but only one of them opens and closes it. The other one is a drain point. The valve at the other end will have just one slot. In both cases the valve is closed when the slot is at right angles to the line of the valve and open when the slot is in line with the line of the valve.
 

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