Adding license details to your assets
All assets on Superhive store and read the metadata that is included with them from Blender. This includes a License field that should always be filled out.
The best way to ensure this metadata is consistent is to add it in Blender when you mark the assets. On the other hand, if you want or need to add the license metadata on Superhive you can do it per asset or in bulk. First select the assets from the Assets tab and then click Edit metadata. This will let you apply the changes to all select assets at once.

In general you should choose one of the licenses that is available on Superhive, which you can read about here.