Where will I get an atomizer?

Your atomizer is your coil. If you put a new coil in, and still get this message, then u probably have a broken or shorted out wire under your 510 connection. (Where your tank screws to the mod) after trying a new coil, and you still get this message, make sure your not still under manufacturer warranty before taking the mod apart. Disassembling these things can be tricky sometimes.