If topos are maintained by a team, only the team members can contribute to the topo information. You can see whether the topos are maintained by a team by checking if it's mentioned under the name of the topo in its main page.
If you would like to add information to the topos maintained by a team, you can request access to the team.
When the topos are NOT maintained by a team, anyone can add information to them. Nevertheless, to protect the information someone has added, other users can't edit or delete information that's not made by them.
In our future updates we will make it possible to make a suggestion that goes straight to the teams maintaining the community or .premium topos!