RE: Can I link my Ethereum address from an exchange to Metamask and do I need to transfer the funds from my exchange address for Uniswap LP?

Do not move funds into wLEO right now. There was a hack about nine days ago. The wLEO/ETH pair has no liquidity at the moment. The LeoFinance developer team has been debugging and fixing the issue. There will be an announcement when wLEO is relaunched.