First practice opening and closing clips. They open and close from edges (not middle). 
Section your hair, starting at bottom of head.
Insert the middle clip in the weft along the top edge of parting, pushing it into the hair (close to scalp, don’t drag clip down the hair), and close clip. Then clip left and right side clips.
Bring down another section of hair and add further strands, to suit your desired style by repeating the previous steps.
Insert side piece at the lowest point of the style. (Side pieces are smaller in width than back pieces). Then section hair above previously inserted side piece, and clip in next side piece.
Make sure you open the clips from the edges (not the middle) before removing them. You may also like to brush your hair to remove knots before taking your hair extensions out.
Buy your clip in hair extensions online here
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