A word of advice: the Ridgeline owner’s manual cautions that you’ll need to use a funnel to add gas to your tank from a gas can. You can find one in the spare tire tool kit found inside its “In-Bed Trunk.”
If your fuel door release button isn’t working, there’s also a manual release to open the fuel door. Here’s what you can do to access it:
If your fuel door is still stuck shut after trying this, it’s possible that there could be a mechanical problem preventing it from opening. If that’s the case, you may want to get help from a mechanic to avoid causing unnecessary damage to the door.