The "Block M" is an icon in the taskbar on LSA Windows systems that provides quick access to information about your system and links to helpful tools.
The 'Block M App' (WLMS Notify) is accessed from the system tray found in the Windows taskbar, as seen below:
If you don't see it, the system tray can hide lesser-used icons. You may need to expand these hidden icons to find it:
Provides guided wizards to assist in mapping various types of network drives.
Full instructions can be found here: Map a Network Drive With WLMS Notify (Block M)