You can refer to the RAID Software User's Guide
To remove a Hot Spare, see section 5.20:To reclaim hot spare disks during normal operation, select the drive and choose Remove HotSpare from the right pane. Web Console changes the state of the selected drives to theREADY state.
To add a disk to existing array, see section 7.1.1. Make sure you select RAID 5 in the "New RAID Level" box.
When I select the drive from the physical view, the right pane only gives me: Fail Drive, Reset Error, Spin Up, Spin Down and Properties.
If I enter the Properties of the disk I have the same options (except Properties).
I would assume I have an old version of the RAID Web Console?
Just to confirm, adding a disk to an existing RAID0 array, to make it a RAID5 array, will not lose data?
OK, so what's the version of your RIAD Web Console, and what's the firmware version of your RAID card? What's the status of this drive?
No you'll not lose data migrating from RAID 0 to RAID 5, however before starting the migration a full system backup is highly recommended, just in case something bad happens during the migration, for example one drive fails.
The easy stuff first:
I have disk 0 and 2 as a member of logicaldrive0 (raid0) and disk1 is a global hotspare.
As far as which version of WebConsole; I clicked on Help, no version information there, I clicked on Support and got a blank page, no version information there either. The title bar of the web page indicates 2.6-00
Firmware 713N is quite old. Current version is 713S.
RAID Web console 2.6-00 is also old. Current version is 2.8-00. I forgot to ask your operating system, but you can find it here. Also check if the RAID driver needs update.
If you still can't remove the hot spare, post a screenshot of the disk property here and we'll see what we can do next.