okay just to refresh what should be in the docs somewhere
given a blender version like say the current 2.76 then
inside the USER folder you should find a scripts\addons\ folder
http://www.blender.org/manual/getting_s ... ayout.html <---details on how to find
if you have a copy of the blendertools from the source copy then just copy the folders as is to the addons folder run blender and then go into the prefs and activate them
if you download the blendertools zip then unzip and copy the make* folders to the addons folder and do likewise (btw the mhx addon is depreciated)
now if you can't find the folder 1 show hidden folders 2 run blender at least once first 3 make sure of what version of blender you are using if you have 2.75 then adjust as needed)