There isn't enough information here, and there's no way we could answer that anyway.
I am guessing you are talking about Sourcetree, as "source path" is a setting in there. If my guess is right, then the answer is "the path to the repository you are trying to access", which would be the url you'd use if you wanted to look at the top level of your source code repository. We have no way of knowing what that url is, because it's your repo you need to know.
If my guess at sourcetree is wrong, then you'll need to tell us what application you're using
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