Start up Shifter Headless WordPress
1. Login to Shifter Headless dashboard
https://go.getshifter.io/admin/headless/
2. Click "Headless"
3. Click your Headless site icon
4. Click [Start] button
5. Booting WordPress
6. Running
7. You can access WordPress dashboard with initial credentials if you haven't changed them.
If you have changed them, use updated.
That's all.