If the problem is that other people don't see your skin online, that's because you are using the demo. Only S2 licensed people can use the automatic skin downloading feature.
ah ok. the skin is actually correctly applied to the car, but there are also colours set (at the bottom in the screen where it says "body", that's step 5 in the link I gave you). move all those sliders to the right, so the car body will turn to white. Then your skin will shine through
1. Mine garaaži
2. Otsi vasakult üles Auto värvid ja vajuta "Uus", kirjuta suvaline nimi
3. Vali alt menüüst "Värvid"
4. Leiad alt koha, kus on kirjas "Tekstuuri nimi" AUTO NIMI" Skini nimi
5. Vajuta skini nime või auto nime peale
6. Vali skin
Well, I hope you won't get mad, if I won't translate it .