ISAs

I am a complete money ignoramus but last year I did invest in the 65+ bonds and also bought ISAs in February.

I have trawled the internet to find out when is the best time to invest in this year's ISAs - am I supposed to do it in February again; or can I do so when I will? And if so, which is the best month to do this in to get the best tax benefit? Do I have to wait till after February?

If any of you money wizards haver an idea about this, I would be very grateful for your thoughts.