OXR - Options OXROA

Hi,

When I purchased my last parcel of Oxiana I recieved some options OXROA. I know I need to pay 25c later in the year but could someone enlighten me on the following :

When exactly do I need to pay for them ?

Will Oxiana send me some correspondance regarding the payment ?

Where do I pay the required amount ?

I hope the questions are no stupid as I am not a market guru like you people.

Thanks