Before you proceed, you need Spaces installed on your phone.
Who can post content in a Tab?
Step 1 - Open the Space for which you want to change the permission for content posting in a Tab and Navigate to the Tab.
Step 2 - Click on the name of the tab.
Step 3 - You can see the information about the Tab. Click on the Settings icon.
Step 4 - It would open up a pop-up screen, choose as per your requirements, who you want to enable to be able to post content under the Tab by Admins, Members, Anyone, and Click on the Save button.
You are done!