There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read this
Apps->panel->objects. Its one of the objects (object_0, object_1, etc.)...it varies. Click the "use_custom_icon" checkbox then go up to "custom_icon". Right click "custom_icon" and the then click "edit key". enter the path of the icon that you want to use.