rb,
From the pc you can right click and  'unlock' then right click and 'delete'
or from the Mark Management window right side select ;Start; and 'delete'

If you mean from your remote....sorry don't know.
Ernie

See the Expedition Event topic under the Instruments section in the Expedition help.

Thanks @Nick and @rbhun -  
I just pulled an Arduino board I had in a different experiment from my boat. My laptop is on a wifi, but I’m thinking I could hook a few buttons up to the Arduino board and link a serial port to the main router with a wifi to serial module https://www.pusr.com/products/rs232/rs485-to-wifi-converters-usr-w610.html It would give me a simple platform to play around with. I think it could be useful to some of the starting features, for MOB, some mark handling as well as setting “tests” – a few buttons to keep Expedition up to date with the sails hoisted would simplify some of the post-race analysis. Obviously I can’t have buttons all over the boat but surely a few could be useful =) but i need to read up on the manual to see what is possible.
 
But I’d be interested in any thoughts and ideas around a magic box for gloves on stressed shorthanded racing =)