Repository cloning - error 403


I’ve forked a repository and now I’m trying to create a local clone of my fork. 

The first time I tried to do it, a Windows Security  connection box appeared, with Enter your credentials for I entered my Github user and password. But I got an error. 

And now, each time I try to clone the repository, I get an error 403:

$ git clone
Cloning into ‘ztrial-scenarios’…
remote: Password authentication is not available for Git operations.
remote: You must use a personal access token or SSH key.
remote: See or
fatal: unable to access ‘’: The requested URL returned error: 403

Github does not let me enter a personal access token or SSH key after my git clone command. 

So, do I have to enter it before trying to clone? If so, how should I process?

Thank you!

Try reinstalling git