Hi @DuckSoldier,
Welcome to the community
To use OpenZeppelin Contracts you should import the contracts. In Remix you can import via GitHub.
To keep your system secure, you should always use the installed code as-is, and neither copy-paste it from online sources, nor modify it yourself.
See the ERC20 example using OpenZeppelin Contracts 2.5:
Also see Remix documentation for importing via GitHub:
https://remix-ide.readthedocs.io/en/latest/import.html#importing-from-github
The contracts in the OpenZeppelin Contracts repository master
branch are part of the upcoming OpenZeppelin Contracts 3.0 (currently at OpenZeppelin Contracts v3.0 final release candidate) and use Solidity 0.6.
I have a simple ERC777 token (using OpenZeppelin 2.5) which can be deployed using OpenZeppelin CLI or Truffle (I would need to put together an example that works in Remix):