If you want to edit a protocol in the Protocols repository (see the image below), you need to be the creator of the protocol.
If a protocol is stored under the Protocols repository tab, other team members can create a copy of it, save it with another name and make changes to it. They create their own copy.
If a protocol is stored under the My protocols tab, other team members cannot access it. However, the creator of the protocol can convert a private protocol to team protocol and make it accessible to others.
To learn more about how to edit a protocol with the Protocols repository see the video below.