Collecting module - Omeka-S restrict access


I set up the Collecting module to allow a list of scientists adding new items.
I have creatd a form and a page on the public view to allow scientists to add items.

However I need to limit the visibility and access of this page, to a closed list of contributors preventing large public from adding items.

Is it possible to change the code in that way as I did not find any possibility to do this on the admin site ?

Many thanks if you have an answer !
Emilie -