Questions about the new Razer Gold & Silver previously zGold MolPoints

Since zGold MolPoints turned into Razer Gold and Silver, I've been having a hard time trying to find how to redeem my 7Eleven PIN to Steam Wallet. Can anyone enlighten me and walk me through the steps on how to redeem 7E PIN to Steam Wallet using the new Razer Gold and Silver? Do I use the PIN on the receipt? And how do I buy Steam Wallet codes? The new layout is confusing me. Please note that I had no prblem doing ll this with the old MolPoints layout.