Use a coffee grinder or spice grinder
Add a small amount of flaxseed to the grinder
Grind in short pulses until finely ground
Check the texture and stop when it looks like a coarse powder
Avoid overgrinding into a paste
Use a blender if you do not have a grinder
Grind only what you need for a few days
Store ground flaxseed in an airtight container
Keep ground flaxseed in the refrigerator or freezer
Clean the grinder after use