This page explains how to check in to a reserved spot on Acall Mobile.

Tap the [Check-in] on the menu at the bottom of the screen, and tap [SCAN] button.

When your screen switches to the camera, scan the QR code placed on the spot within the green frame.

Check-in is complete.

Tap the [OK] button.

 Note
If the spot is not reserved, it will be available for immediate use, and a screen to select the end time will be displayed. 
Please refer to the following help article. 
"Using a spot immediately from Acall Mobile"