My website has a submission page which lets user submit their post in the collection. However, although they are already the member, I need to ask their name again in the submission in order to add and see their name in the collection. Is there a way to automatically add a member’s name to the collection when they submit something?
The only way you can “automatically” know a user’s name is if you require them to login. One way is to use the promptLogin() function of the wix-users API.
See more information on this page. Maybe it will help too
https://support.wix.com/en/article/creating-custom-member-profile-pages