Hello LoveXD,
You can only use the paintjobs available ingame, if you're starting, you will unlock a few more when you level up.
You can buy addtional liveries/paintjobs available on steam.
If you meant using custom liveries, you can only use those in singleplayer as TruckersMP do not support custom mods.
I hope it helps answering your question.
Best Regards,
The Witcher
"... I've seen that, frustration.. Been crossed and lost and told no ...And I've come back, unshaken.. I don't hold back, I hold my own, I can't fall back, I came too far.. "
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