Tax help.

[puglove]

As most of you know. iv just bought the state last week, but the tax runs out this week. as you can prob guess i havnt got the log book. and chances are it isnt registered to me. so this means if i apply online it will go to the previous owner. but if i go down the post office i cant tax it because i dont have tge log book. i also dont have a tax reminder, so how am i supposed to tax it??