Hi,
There are 2 types of verification on etehrscan.io:
1. Source Code VerificationThis is already done on your Smart Contract as you can see on the Smart Contract etherscan Link:
https://etherscan.io/address/0x6f5f4798dacad912612d06a30b4683e92f3f6f54#codeYou can see a "Yes" on the "Contract Source" Tab, this means the source code is already verified.
2. Etherscan.io Token VerificationThis is the verification that you see on the token link:
https://etherscan.io/token/0x6f5f4798dacad912612d06a30b4683e92f3f6f54For you to verify this, you have to contact ethescan.io:
https://etherscan.io/contactusThis verification is not about the Smart Contract Source Code, is a manual verification done by etherscan.io staff (place logo, confirm that website exists, etc.)
About the warning you mentioned, it's not relevant for the ERC20 Contracts created by Minereum Token Service since there is no function with string inputs (except the SetupToken which is only setup once)