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Show Account name in Record Information Tab

Hi everyone,
i try to build an Participants list. If the user wants to join the Meeting, he can click on the new button next to the Participants-List (see Screenshot below) and the Meeting-Name and his account is automatically displayed. 
But, i dont know how to associate my User-Account "NRA Customer"
​​​to the Objekt "Participants". (Please ignore the NRAAccount-Objekt in the screenshot)
Does anybody have an idee, how do i create this?Screenshot2Screenshot3