1) While creating or editing a Resource Article, click "Save" in the top right corner.
2) When you are in the "Add/Edit" view of Resources, you will be able to see your Article Drafts in the menu on the right-hand side of your screen!
3) Click on the title of the Article you want to keep working on to go back to your Draft.
4) In the top right corner of "Drafts," use the dropdown arrow to filter by All Drafts, or My Drafts. My Drafts will filter to the Articles that you've created only.