---- javierroafelices <[EMAIL PROTECTED]> wrote: 
> Hi, this is Javier, I´m new at this group. I would like to know how 
> this libraries thing work. I have downloaded a lot of them, but don´t 
> know where to install them, or how to use them.
 
You copy them them into your kicad\library or kicad\modules directory depending 
on what you downloaded.

> I´m trying to draw an schematich using eeschema, but I can´t find a 
> MPSA18 transistor, should I use any other NPN transistor for the 
> schematic?

You can use any npn transistor with the same pin numbers  and change the name 
of it and then when you start a pcb you select a footprint that matches you 
pinout

> I would like to know how to edit a power conection to make it 4.5, as 
> it says I can´t change that value in one that is already built.

I think you have to create a new power port.

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