Before you search for the manual, you must confirm you have the correct board. The Foxconn ML194V-0 is a micro-ATX (mATX) board with the following physical identifiers:
Connecting the computer case buttons to the motherboard is the most challenging part of a custom build without the physical booklet. Foxconn boards typically use a standard Intel 9-pin or 10-pin front panel header layout block.
To enable the headphone jacks and USB ports on the front of your computer chassis, locate the internal shrouded headers on the lower edge of the board. Front Panel Audio (F_AUDIO)