I've noticed that some organizations on GitHub have different labels that they can apply to issues.
For example, one organization that I am a part of allows any of these labels to be applied:
However, on my personal account, I am limited to only these labels, and I can't find a way to create my own custom ones:
Any ideas on how I can go about creating my own?
It looks like you might be accessing GitHub on a mobile device, which likely exposes a somewhat different interface.
On the full web interface, simply navigate to https://github.com/:user/:repo/labels
and click the green "New label" button at the top right. Existing labels can be edited or deleted on the same page.
You can also get to this page by clicking on "issues" and then "labels".