Assuming the link you give is enough to work out where the rest of the stuff goes, the
mbboard package comes with two folders:
source. In your local texmf folder (as described in the link you read) make a new folder inside the
fonts folder named
source. Inside that, make a folder called
mbboard and put all of the contents of the downloaded
source folder into that new folder.
texinputs folder, you will find a few files:
mbboard.sty goes into
mbboard.tex goes into
mbboard.dcl goes into
Once you have done this, you will need to refresh the MikTeX package database.
The documentation for the package is the plain TeX file
mbbtest.tex. Open this file and compile it using plain tex (not latex). If you put the resulting pdf into the
doc folder of your local texmf folder, then the documentation system will find it too. (It might be useful to rename it