Hi, Welcome to the Forum Morgray!
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There are several ways.Could you please tell if it's possible to assign single drum samples to my midi keyboard? I know that when you use VST it's automatically can be played on midi keyboard, but what if I have some single strokes for example snare and bass drum?
The simplest is to add a zynAddSunFX to your songeditor, and insert the preset Drums.
You get your default MIDI-percussion loaded
The same can be done if you DL a general-midi-soundfont, but you get many more percussion sets and also some FX-sounds
Third method is to find a VST-sampler, and use that. You can then load any sample you have, and assign it to a key. In LMMS the only sampler that can be used are this one: