Hi cybekal,
welcome to the Apple (user-to-user) Community.
Re: "I can not find the Superdrive on my desktop".
Seems you can not use a hub with the superdrive. The Superdive must plug directly into the computer-port
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If you still need help:
Wondering whether your iMac model is compatible: How to: Identify your iMac model - Apple Support
and which Superdive you have : Seems the ZM/A version is no longer available (superseded)
and the LL/A version is the one that is currently available
Apple USB SuperDrive - Apple
Says:
*The Apple USB SuperDrive is compatible with Mac models from 2008 and later that don't have a built-in optical drive. The compatible iMac versions listed are:
iMac (Retina 4K, 21.5-inch, 2019)
iMac (Retina 4K, 21.5-inch, 2017)
iMac (Retina 4K, 21.5-inch, Late 2015)
iMac (Retina 5K, 27-inch, 2019–2020)
iMac (Retina 5K, 27-inch, 2017)
iMac (Retina 5K, 27-inch, Late 2014–2015)
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More info. / support / contact options etc., : iMac Support Website: iMac - Official Apple Support
All the best :-)