If you make a mistake adding a marker to a Zeemaps map our community team won't have access to edit it for you, but if you come back to the map from the same browser that you used to create the marker, you should be able to edit it. To do so, click on the marker to open its information balloon and then click on the marker name. This will bring up an edit dialog that will allow you to make changes to your entry.
If that doesn't work, if you send a link of the map with your entry details to firstname.lastname@example.org they’ll be able to delete the entry.
Because Padlet's a third party site we're limited as to what support we can provide, but their support section is here.
You can also check out our Padlet tips here.