Push the Zero Emissions button, then push Climate Control Timer. All of the settings are in there. You can also access pre-heating through carwings (phone or through nissan's web site).
It's a good idea to set the charging end timer as well. You'll want the charging to finish just before you leave so the pack is still warm. It may take a little experimenting to get the time right since the end timer doesn't work very well on the LEAF. It usually finishes charging several hours before it's supposed to.
2012 Nissan LEAF SV
20% degradation in 42k miles
Leased 5-17-2012, Returned 1-15-2016
2017 Chevy Volt LT
Siren Red Tintcoat