You'll have to use a host. I personally use both www.imageshack.us/ and photobucket.com/. Both have their ups and downs (I think imageshack is the best for full sized EQ screenies, since it doesnt shrink larger sized pictures), and both are free. Then you just put [link.] and [/link.] around your link to make it a link here (without the periods) and shazaam, there you go :)
Actually you can post your screenshots is at EQ2 PLayers. Just log in with your station.com id and there you go. I think you can store like 50 pictures there. Photobucket is good too.