Plasmids can be submitted in either form. For DNA, aliquot 15 µL of DNA into a 1.5 mL microfuge tube (at a concentration of 0.2 -1µg/µL) and use Addgene's prepaid shipping materials.

For bacterial cultures, streak the glycerol stock onto a plate with the appropriate antibiotic. If you send bacteria, you will be responsible for packaging and shipping the sample according to safety guidelines.