I don't think we can really help with this, you'll probably have to work it out yourself. How was the drive put in the cage? Did it have any screws or rails?
Has the drive trays under the basement at the front, yes?
Should just be a matter of unscrewing it if screwed in. That might require further disassembly of the case. If they are toolless trays then you probably just need to apply a little pressure to the sheet metal outwards to make a little more room.
looks like it slides in and out.squeeze the clip ends together and pull it out.might have to push it in a little while depressing the clip and then pull it out.
If it uses rails, it should be a matter of pushing the rail clips together, which would then allow you to pull the drive out. You'll have to find those clips on the rail, which might be facing the other way if you installed it like that.