How to submit a Pull/Merge Request?

Hello all, I've added some functionality to openfoam that I believe others would find useful, however, I am not sure how to fork this repo and create pull/merge request.

In the first place, I was not able to create a fork of the repo, so I am doing the developing on a clone of this repo. Which seems to be what is recommended anyhow: https://develop.openfoam.com/Development/openfoam/-/wikis/coding/git-workflow#workflow

I tried following the directions on the wiki to submit my code, however, I get the following error:

128 acxz@archard ../openfoam/src/renumber/renumberMethods (git)-[feature-symamd] % git push -u origin feature-symamd
remote: 
remote: ========================================================================
remote: 
remote: You are not allowed to push code to this project.
remote: 
remote: ========================================================================
remote: 
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Which makes sense, since we probably don't want anyone to willy nilly spam the git branches of this repo.

Ideally, users should be able to fork this repo and then submit merge requests, instead of creating requests from upstream branches.

In any case, how can I create a merge request to openfoam?