Currently, there is no capacity to allow "evidences" to be modify. We only have the capacity to delete them. It would be very useful to have such a capacity for the simple reason that, some times, teachers make honest mistakes like a typo, forgetting a word or writing the evidence to the wrong student. They have to delete the evidence and start over again.

The only solution is to tell them to copy their evidence somewhere in word or notepad before deleting and then paste it all back. If only there was a modify button, we could save so much time and effort, especially for those who insert screenshots in their comments.

Furthermore, it would be useful to have two capacities : the first to modify our own evidences and the second, to modify others users evidences.

After searching around forums and trackers, I'm surprised this issue has not come up. As far as I know, this is an issue for all the versions.