help needed to withdraw from the electrum testnet wallet?
I'm not sure I understand what you mean - or understand - by withdrawing.
If you want to transfer between wallets - it works like normal bitcoin, just the addresses look a bit different.
If you want to send to an exchange and sell for fiat - well, that's not an option because testnet coins are not valuable (they are for free), hence exchanges don't offer deposit addresses on testnet blockchain (which is also different than main blockchain)
You can see testnet similar to a different coin that worth nothing.