So simple, why are you guys troubling Op?
@Houdini76 if you have Ethereum on Binance and you want it on BSC network in your Metamask and you have added the network correctly in your Metamask as shown in stedsm's post, follow the instructions:

1. Select Smart Chain (mainnet) network in your Metamask

2. Click on '+Add tokens' there

3. Visit https://bscscan.com/token/0x2170ed0880ac9a755fd29b2688956bd959f933f8

or do as I show you:
Contract: 0x2170ed0880ac9a755fd29b2688956bd959f933f8

Decimal: 18

Symbol: ETH

This is Binance Smart Chain Pegged Ethereum

4. Once it is done, you will see Eth in your tokens list.

5. Copy your Eth address and come back to Binance.

6. Go to withdrawal and select Ethereum

7. Paste your address, but make sure you change the network from ERC20 to BEP20 (BSC), fee will be only 0.000089 Eth.

8. Confirm your withdrawal and wait for your coins to arrive at Metamask.