OK I see you edited you original post to add your bike and in particular the fact that its standard quick release (not thru axle).
- The H3 does not ship with a trainer skewer or thru axle skewer.
- For your bike that is the standard quick release, you will need to buy a skewer like this one.
- Ignore thru axle issues. They do not matter until you want to put a modern disc brake bike on there.
See if this video helps at all.