Is it posible to deleta a change?
I’m have tried to help a friend to reverse a change he made, but we only did it worse.
HELP.
Hi and welcome to OSM and the forum
With every change on an OSM object (node, way, relation) the object gets a new version-number. A revert or rollback can be done by downloading the previous version of the object(s), replacing the values and upload the object(s) again (as a new version).
Can you post a link to the changeset(s) so we can take a look? (www.openstreetmap.org → Your friends profile → My changes)