GitLab CE installed on Debian8 Server, how to enable https?

I’m just new to GitLab, have installed the latest Gitlab CE to a Debian8 Server, seems to work fine so far.
But i am wondering how to install and enable TLS for the website?
Creating cert request, forward port 80 to 443 etc. ?

Thanks in advance.

@Darkmoon I am not sure whether you were able to get around this but we have plenty of documentation on the subject: