How do I load a spool for a black and decker dual feed strimmer:confused:

You Need To Measure Off About 15 Feet Of Line, Then Find The Middle And Pull One End About 3 To 4 Inches Longer Than The Other. Then Find The Slot, Or Groove In The Center Of The Spool, There Should Be An Arrow Indicating Direction To Wind Trimmer Line, Begin Winding And When You Are Near The End Of The Lines, Place Them On The Holding Grooves At The Top Side Edge Of The Spool. Then Reinsert The Spool Into The Trimmer Head, Attach With Bolt Or Nut As Equipped And Go To Trimming.