The permissions and apparence of the Data Portal are different for different users.
Access levels will include individual users, user roles, project members, and public.
Permissions will be read, add/upload, edit/replace and delete on data and metadata provided to the Data Portal.
Edit permissions will depend on the access rights connected to your login username.
To add metadata, add persons, institutes, images etc.,
requires that you login with a username authorized for this operation.
Some metadata, data and some advanced features are only available to authenticated users.