To log your rides you will need to have a VESC type controller with Bluetooth enabled to connect to it using your mobile phone.

Install the "VESC Tool" app for iOS or Android, connect to your board and enable "RT Data Logging". You can choose a place to store files by using the "Browse" button or just leave it to default.

Here's a screenshot (iOS):

Use your file browser to locate the logs after riding:

Open in your browser and upload your log.
VESC is a registered trademark of Benjamin Vedder. VESC is an open source motor controller hard- and software. is not affiliated with VESC. Please check out The VESC Project here.