I have two drives on my computer, an HDD (C drive) and an SSD (D drive). I cloned Windows 10 into the SSD and changed the boot order in the BIOS so that the SSD is first, but the computer still boots into the HDD. What do I do?
Please show us a screencap of your Disk Management window.
The C and D drive letters can be a bit confusing.
The C is whatever drive or partition the system is booted from.
Also, at the end of the clone process, did you power OFF, physically disconnect the old drive, and attempt to power up from only the new?
If not...you really needed to do that.
What software did you use for this clone operation?