1)
In what sense is Hashem with them?
1.
Malbim: The supreme Hashgachah is drawn after deeds of lower beings, and like their Midos. If you are (act like) Am Hashem, He is with you to have Hashgachah on you.
2)
What is the meaning of "Im Tidreshu"?
1.
Malbim: If you will seek Him more, and investigate and be diligent in His Avodah.
