How to place NPN transistor on board

I’ve made simple schematics (multivibrator) containing 4 resistors, 2 capacitors, 2 NPN transistors, 2 pinheads, VCC symbol and GND symbol.
After opening board editor I can’t place transistors - they haven’t pinouts.

Can somebody explain how to place transistor on board.

I think - you used the transistor from LibrePCB Base library, which haven`t assigned a package to symbol (Device doesn’t exist). Due to this, you can place a symbol to schematic, but not footprint (package) to PCB.

Try to look inside this library:
Content some common PNP and NPN transistors with assigned package (Components for schematic are created and Device for PCB also)

How it works are described here:

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