How i can install mods?

http://www.beamng.com/resources/

There is a giant 'HOW TO INSTALL MODS' button there.

 

Are you sure the mods are compatible with the latest version of the game?

Please go to Steam, Right-Click BeamNG.Drive in the library, go to options and then Local Files tab. Press the 'Browse Local Files' button.
Run 'support.exe' in the folder that opens and press the 'Submit Information' button.
Leave here your ID.

The logs will allow me to see why you aren't seeing those mods.

 

What version then?
Humble Bundle? The 'support.exe' is still in the BeamNG.Drive directory.

 

That's because you haven't updated your game.
This is the 'update instructions' for Humble Bundle versions:
http://wiki.beamng.com/Updating_the_game#Humble_Bundle

I highly suggest to redeem your Steam Key to keep your game up to date automatically.

Support.exe was being distributed from 0.5.1.0

 

As written in the Wiki page, you have to redownload the game each time an update is out if you want to use it without Steam.
The Humble Bundle version should be up to date. If you re-downloaded it recently and still isn't, then something went wrong on the HB side :\
Will get that checked.

 

Checked that.
We had major technical issues with HB, and update 0.5.1.0 is not reachable via that platform.
Yet you can grab it by activating your copy of BeamNG.Drive on Steam.
I'm terribly sorry for the inconvenience.

The next, soon to come, update (0.5.2.0) will be avalaible on both platforms.

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Since 'support.exe' is not doable, do this:

Go to Documents/BeamNG.Drive
Find 'beamng.log' (or simply 'beamng' if you don't have file extensions enabled) and upload it here.
Then go to the 'mods' folder and find 'db.json' (or 'db' for the same reason above) and upload it here too.

Those files will tell what's going on with your mods.

 

Mods are there and are being loaded.
Are you sure you are not overlooking them in the vehicle selector?

If you go in the Mod Manager, you should see all the mods that are active and not.