How can I regulate pressure to a BAXI LUNA 240i boiler?

Question

I need to increase the pressure to the boiler, how should i proceed? Checked on youtube and found a couple of systems but they do not apply to my model (at least not at first sight).

Some pics here (click for full size):

This boiler also feeds the floor heating system.

Answer 1

Here's the manual in Italian and Spanish¹, if you can read it.
The part about pressuring is usually covered at the beginning in maintenance but more fully explained in the installation section.

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¹ Cheers for clarifying the language.