How do I add SLF4J to a class path?

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New Member
Jul 29, 2019
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Title:
How do I add SLF4J to a class path?
Launcher Version:
1.4.7
Modpack:
All Of Them
Modpack Version:
Latest
Log Link:
Details of the issue:
Alright so I looked through my log and found an error that said:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

So I followed up at the website and it told me to download a file and add it to the class path, I was wondering where the class path is and how I add the file to it?