See where it says "Signed in as Ashley" up to your left? Go to "My Profile" and then to the right side it will say "Edit my profile"
When you hit "Edit My Profile" you look to the left & it says "Edit Signature", etc.
FRom the first screen you can add your tank(s) and the stocking of each. Let me know if you want to add a pictrure to your signature and I'll walk your through it.