To learn how to make a pull request I just followed two separate help pages on Github (linked below as bullet points). The following command line commands are for Part 1. Part 2, the actual pull request, is done entirely on Github's website.
$ git clone https://github.com/tim-peterson/dwolla-php.git
$ cd dwolla-php
$ git remote add upstream https://github.com/Dwolla/dwolla-php.git
$ git fetch upstream
// make your changes to this newly cloned, local repo
$ git add .
$ git commit -m '1st commit to dwolla'
$ git push origin master
Part 1: fork someone's repo: https://help.github.com/articles/fork-a-repo
git clone->cd dwolla-php->git remote->git fetch
sequence above to clone your fork somewhere in your computer (i.e., "copy/paste" it to, in this case: third_party TimPeterson$
) and sync it with the master repo (Dwolla/dwolla-php)git add->git commit->git push
sequence above to push your changes to the remote repo, i.e., your fork on Github (tim-peterson/dwolla-php)Part 2: make pull-request: https://help.github.com/articles/using-pull-requests