In the presets list (found under the bookmark icon), there are no email icons next to the preset names so I can't send drills to my students.
You are not logged in to Flashnote Derby as a teacher or someone has disabled teacher mode in your device's Settings app.
In Flashnote Derby, tap on the Settings icon at the top of the screen.
Scroll down to the bottom and look for a setting marked Teacher Login.
If you see a switch labeled Teacher Login and it is turned off, then you have either not created an account or have logged off. Follow the instructions for creating a teacher account to register or log in again.
If you are 100% sure there is nothing labeled Teacher Login in your settings, then Teacher Mode has been disabled on your device. You can enable Teacher Mode by going to your device's Settings app. Follow these instructions.