You can use the following credentials to login:
User: user@nextsoftwaresolutions.com
Password: user

You can use the following credentials to send statements to this LRS:
Endpoint: https://demo.nextsoftwaresolutions.com/grassblade-lrs/xAPI/
API User: 14-86ffb64c8768015
API Password: 68092ad5616fe0e48e65df49c

Note: Data sent to the LRS is public.