How to fork a repository?

Question

Licenses for software and other works

I'm forking a repository under the MIT license to add the functionality I need. I plan to publish the modified library.
Can I replace the license (LICENSE file) with my own, or delete it?
Can I rewrite the README file?
Do I have to refer to the author in the license or readme (the repository is already marked as forked)?
I do not plan to claim authorship, solely for ease of use.

Answer 1

Can I replace the license (LICENSE file) with my own, or delete it?

Yes, but if you publish, you must indicate that your fork is based on another product under the MIT license.

Can I rewrite the README file?

Yes