In Postmypost, go to the "Accounts" section and click "Connect."
In the window that opens with a list of social networks, click "Connect" next to Tumblr.
A window will open for officially connecting your Tumblr account to Postmypost, which will specify the specific data
and permissions Postmypost requires. Make sure you agree to this access and click "Connect."
Once successfully connected, you will automatically return to Postmypost, where a list of available accounts will
open. Check the boxes next to the ones you want and click "Connect."