Laravel DB Select Query - laravel-5

Question

I'm learning Laravel 5. Need help with query and print in blade.
I have one table with users info and one table with Steam info where I have user_id row.
How can I build this query:
SELECT username FROM steam WHERE id = user_id;
user_id is logged user in session
users table
id | email | username | password |
steam table
id | user_id | username | steam_id | avatar
Steam.php
<?php
namespace SGN\Models;
use SGN\Models\User;
use Illuminate\Database\Eloquent\Model;
use Invisnik\LaravelSteamAuth\SteamAuth;
class Steam extends Model
{
protected $table = 'steam';
protected $fillable = [
'user_id',
'username',
'avatar',
'steamid',
];
protected $hidden = [
'remember_token',
];
}
SteamController.php
<?php
namespace SGN\Http\Controllers;
use Auth;
use SGN\Models\Steam;
use Invisnik\LaravelSteamAuth\SteamAuth;
class SteamController extends Controller
{
private $steam;
public function __construct(SteamAuth $steam)
{
$this->steam = $steam;
}
public function login()
{
if ($this->steam->validate()) {
$user_id = Auth::user()->id;
$info = $this->steam->getUserInfo();
if (!is_null($info)) {
$user = Steam::where('steamid', $info->getSteamID64())->first();
if (is_null($user)) {
$user = Steam::create([
'user_id' => $user_id,
'username' => $info->getNick(),
'avatar' => $info->getProfilePictureFull(),
'steamid' => $info->getSteamID64()
]);
}
//Auth::login($user, true);
return redirect('/'); // redirect to site
}
}
return $this->steam->redirect(); // redirect to Steam login page
}
protected function create(array $data)
{
return Steam::create([
'username' => $data['username'],
'steamid' => $data['steamid'],
'avatar' => $data['avatar'],
]);
}
}
edit.blade.php
#section('content')
<h3>Update your profile</h3>
<div class="row">
<div class="col-lg-3">
Here print steam username from DB
</div>
</div>
#stop