the 1st option needs u to pay 5month money for 6month value, but it is a lump sum
the 2nd is the regular one, i use this,

please follow the instruction, do a click, u can see the form, such as personal billing info, etc.
note: they r usa$, but it dosnt matter if u have canadian credit card, they do the conversion , for example ~15.00cdn$/mo

the 3rd option is to let u wait till next month.

another option is personal cheque serverice, but it requires a 6month committment, and needs usa$ cheque i guress.