1. Sometimes it is not a good idea to run a single frequency for a long time... When I searched the Programs database for "7.82,", one set came up that only has 7.82 and 10000... If it wouldn't be a problem for you to run these two frequencies, then choose the Shell Preset - "Healing (R) - JW" which will run until stopped, then populate it with the "Concentration" Preset, and run.
If you need just the single frequency, look in the User Guide for "Create Program" and follow the instructions. Once you have it made, then load it just like above in place of the Concentration program.
2. There is a good preset that generates the Schumann Resonance and the Geomagnetic frequencies which is to keep the energies (yin/yang) in balance. On the preset tab click Heal, remote - Schumann Resonator. See the notes of the preset for very detailed information.
3. Not wanting to change your mind or debate, but normally the "earthing" frequency is associated with the 7.83 Hz Schumann Resonance.
For more details, please check the link: