With Authory you can not only import and back up your content 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:
Go to your Content section and click the button labelled "Add content"
Select "Write content"
Write whatever comes to your mind, then click the button "Save changes"
By default, your articles will be published in your Authory source. By default it's called "Firstname on Authory". You can change the name of this publication anytime though.
If you want to change the source, then simply use the dropdown to select another one.