How do I get BNB into my polygon account on metamask?

[ROGERTHAT777]

I am wondering what I need to do. I have bnb in my metmask and I want to trade polygon.  I have the netwrok added but if I send address to address bnb it doesn't end up in my polygon mainnet of my metamask.  I hope that makes sense.  I need the bnb to post to the account balance within the polygon side.

[jc12345]

If you have BNB in Metamask it means that you have BNB BEP20 on BSC in Metamask. Polygon is a different network from BSC, although you have the same addresses on all three of ETH, BSC and Polygon. You cannot just send BNB on BSC to Polygon. For this to work you need a cross-chain bridge. You can use something like rubic.exchange or multichain router to swap your BNB on BSC to BNB on Polygon. But I wouldn't recommend that you swap to BNB on Polygon. I don't think there is enough liquidity to make it worth it and you are just going to get bad deals. If you are going to swap to Polygon, rather swap to Matic on Polygon or one of the USD stable coins like USDC, it is much more versatile and more liquidity.  

[Kavelj22]

I am wondering what I need to do. I have bnb in my metmask and I want to trade polygon.  I have the netwrok added but if I send address to address bnb it doesn't end up in my polygon mainnet of my metamask.  I hope that makes sense.  I need the bnb to post to the account balance within the polygon side.

Those are different networks within the Ethereum blockchain itself. The simplest way is to swap those BNB into a cryptocurrency supported by the Polygon network including BNB itself which is also supported by Polygon as well.
I understand the query of many users and their willing to migrate to another cheaper blockchain because of the high fees for ERC transactions and NFTs as well.

[shinratensei_]

I am wondering what I need to do. I have bnb in my metmask and I want to trade polygon. 

Send your BNB to the cex and try to convert it into polygon and send your polygon back again to your metamask.

I have the netwrok added but if I send address to address bnb it doesn't end up in my polygon mainnet of my metamask.  I hope that makes sense.  I need the bnb to post to the account balance within the polygon side.

Polygon and BNB BSC are using the same address but different RPC and network. The best way to send your BNB to the centralized exchange site and then you can try to transfer it back again to your account. This is the best thing that you can do that. That makes sense. You need to convert it caused by both are using a different network. Just follow my suggestion and this is the best choice for you.