Dilute your DNA sample with the 6x DNA Loading Dye Buffer: mix 1 volume of the Loading Dye Buffer with 5 volumes of your DNA sample.
Loading Dye Buffers contain glycerol that ensures that the DNA in the ladder and sample forms a layer at the bottom of the well, and color markers (e.g. Bromophenol blue, Xylene cyanole FF, Orange G) for visual tracking of DNA migration during electrophoresis.
For the best results, use Solis BioDyne 6x Loading Dye Buffers (Blue Dye Cat. No. 07-01-00010, Double Blue Dye 07-02-00010, Orange Dye 07-04-00010, Orange Blue Dye 07-03-00010).