[Ci-users] How to add new credentials?

Hello,

I am adding new jobs for devtools/fabric8-analytics projects via [1], but I'd also need to add new credentials (API key) to Jenkins that I could later use in E2E tests. Is there documentation somewhere on how to do that? Can someone please point me in the right direction? I have the API key, I know how to later use it in my jobs, I just don't know how to add it to Jenkins.

Thanks, Michal

[1]: https://github.com/almighty/almighty-jobs