Smartapp to control Smartoutlet at sunset

Hi - I’ve just taken the plunge and bought the ST hub with some sensors. I think I’ve successfully setup a flood sensor in my crawl space and open/close sensors on my exterior doors, which was pretty straightforward. I now want to configure a SmartOutlet to turn on at sunset then turn off x number of hours later. I assume I need to add a SmartApp to the SmartOutlet in the app (like I did for the flood detector to send me a text if it gets wet), but I can’t seem to do it. I’ve looked thru the Support section and searched the forum but I can’t find anything on this. I must be missing something basic here. BTW, I can see the SmartOutlet in the app and can turn it on and off via the app, but that seems to be all I can do with it.

Any suggestions greatly appreciated!

Cheers
Simon

Smart Lighting under recommended apps.

Thanks Brian, that’s great. All working now!
Cheers
Simon