Passport-local, register user when he opens page

I'm using passport-local and I wonder how can I make registered a user when he opens site? Also I followed this tutorial :

app.post('/register', passport.authenticate('local-signup', {
    successRedirect: '/main',
    failureRedirect: '/',
    failureFlash: true
}));

app.post('/login', passport.authenticate('local-login', {
    successRedirect: '/main',
    failureRedirect: '/',
    failureFlash: true
}));

app.get('/main', isLogin, function(req, res) { .... });