I use the standard (blue) Flitz metal polish. I have used it on the silver electroplating on others' firearms on occasion with no noticeable bad attributes, but since I don't own any firearms with silver plating I can't give you the lowdown on long-term usage.
If the blue Filtz is the one with the warning, then I guess I would go by their recommendations. Better safe than sorry.
As for the forum...I'm tickled pink you feel welcomed here. This is truly a very outstanding group of men here in this camp and I'm proud to be here. If there is anything I can do to make it a better forum please do not hesitate to speak up! I'll do my best!