[Ethereal-users] How to decrypt WEP - where do I enter the key

[tz]

I noticed what appears to be WEP (encryption for 802.11b, wifi) 
decoding within ethereal.

But I can't find ANYTHING in the FAQ, manpage, or anything else that 
tells me where to enter the wep key.

My cards can't capture with wep on, but with wep off I have to 
post-process.

How do I do this?