Ajax POST Request “posts” as admin?

I’m using another domain to post to my WordPress forum, with the help of this API: https://wordpress.org/plugins/bbp-api/

When I post my AJAX request, it is successful in posting all data including the title and content of the forum, but it posts as “admin” instead of as the input value within “name”.

I’ve already dug into the plugin. I know that I have to trigger the post request to post as anonymously so it can allow the input value (rather than overwriting it as admin), but not sure how to do this.