Since nobody answered to this question in the 'General Forum', I give it another try here:
I am using a Chat-Tool (tawk.to) to be able to chat with my visitors / students.
Currently they have to enter their name manually so I can identify them.
There is an option to pass the Username and Email to the tawk.to script by adding the following script to the 'additional HTML' section:
How can I pass these variables to the script?