Hi,
You can send a string to the same tag as the Textbox. Make sure you have the right port in there! you can set the incoming port in the OSC part of the Kiosc menu at the top of the screen.
Please note that Kiosc Editor uses the default port of 8000. Running Kiosc Editor and Kiosc on the same device will block port 8000 and you will not receive the message. Either close both and reopen only Kiosc, or use a different port (8001 for example)
Don't forget to set the OSC destination IP address in the CueCore2.
Greetings,
Bootsy