Welcome to the community Lawrence
If you have submitted a patch to the tracker issue (what is the tracker issue id?) then if you are new to the process you will need to wait for someone to submit it for peer review for you, I believe. You can speed that process up by posting here - as you have done, but with the tracker reference - so that someone can go and look at the issue and mark it for peer review for you (raising awareness of the issue you have worked on and telling people that there is something there to be reviewed).
Once you have had some code accepted, you 'earn' the right to submit for peer review yourself. At least that is my (simplified) understanding of the process
With regard to the github pull request, as I believe Andrew's email said, no issues are dealt with through there, so ANY pull requests would be closed and not acted on through the github repository - it is a mirror of the main code base and not used to actually manage pull requests from anyone regardless of their experience or the quality or the urgency of the request. That's just down to the way the core moodle code is managed and released - its managed through the tracker issues, and its released through the github mirror (as well as through the main site downloads).
I'm sure if you can provide the tracker reference, someone will take a look at your patch and progress it from there as appropriate.