How do I load a ticket onto the Smartcard?

I buy a daily ticket 1-3 times a week and my phone tends to demagnetise it which is frustrating and means I have to find a barrier with a guard.

I have a Smartcard but how do I buy a daily ticket and load it on?   I know I have to use a machine at the station (Farnborough Main) and can't do it online, but I dont know how to do that.  There's usually a queue behind me so I don't have time to try different things at the machine, and it doesn't give me any options, before spitting out a paper ticket.  

Thanks