According to the OTHER POST that USAFret spent time helping you with, you never clarified whether:
1) You mean to CLONE to the new SSD, or
2) Simply use the new 256GB SSD for secondary storage (apparently Steam games)
So...
#1 - if you want to CLONE please be clear about that
#2 - if it's just for STORAGE then use DISK MANAGEMENT to change the drive letter to "E" (if it's the second drive) as suggested. Otherwise "F" or whatever.
*Then, if you have now installed PROGRAMS to the new drive you may need to DELETE them and reinstall as the links may be a mess.
**If you made a new STEAM folder (which is easy in Library settings in Steam such as "E:\Steam") to store additional Steam games you can simply go back into Steam and create a...