How can I get username of a person who logged in to view a card?

It sounds like Publication Groups may be what you're looking for. (A more detailed version of this would be Personalized Data Permissions). Publication Groups allow you to limit the data displayed to only rows where the specific user has access.

Here's a link to a walkthrough on setting up a publication group.

https://dojo.domo.com/t5/New-to-Domo-and-Admin-questions/How-do-you-create-a-publication-group-and-filter-pages-for/td-p/30393

Hope this helps,

Valiant

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