With Authory you can not only import and back up your articles from other sources. You can also write and publish articles directly on Authory. Please note this is currently only possible from a desktop device/computer, not from your smartphone.
Here is how:
Log in to your Authory account and click "Add new article" in the sidebar menu.
Select "Write on Authory"
Write whatever comes to your mind, then click the button "Publish":
By default, all articles that you publish on Authory are set to public, meaning anybody visiting your Authory page can read them. You can change that anytime though after publishing the article. More on article Visibility here.
Also, your articles will be published in your Authory publication. By default it's called "Firstname on Authory". You can change the name of this publication anytime though.
If you actually don't want to write and publish an article from scratch, but instead want to copy&paste an article that is/was already existing somewhere else, then you can do that here.