It would appear your using a v2.x My Cloud. The v2.x My Cloud User Manual claims to indicate two places in the user manual where there is a shutdown option yet both locations, page 32 and page 63, do not appear to show an actual shutdown button.
If there is no actual button to shutdown the v2.x My Cloud one can, as explained above still shutdown the My Cloud using SSH.
While I don’t use the WD Quick View software it is possible that software also has the option to shutdown the My Cloud. The WD Quick View software can be downloaded from the WD Support site.
