Not familiar with this one but seeing as it charges different types of batteries its going to be in the menu somewhere.
Have you tried scrolling through the menu options? Normally the discharge menu options are either off the charge options or before \ after the charge menu. So somewhere in the menu you have the option to select battery type ie nimh, SLA, Lipo etc, and then select and set charge rate. I'd expect the option to discharge will be off this. If not, it should have its own separate menu option.
If you are wanting to balance, cycle and charge Lipos, you normally need to plug the charge lead into the 'normal' lipo leads and charge and also plug ght lipo balancer lead into it and the lipo's balancer lead. The balancing of the lipo battery takes place at the same time as charging. You dont normally need to cycle lipos.
Again, if they are Nimh cells you want to cycle, then this option is normally off the charging menu since you'll be charging, discharging and re charging the pack to cycle them.