how do you change from decimal odds

Subtract 1

Easiest way is with an odds converter.
Look here:   http://www.racing-index.com/decimal-odds-conversion.html

even easier.. just hover over the odds on here :)

As Aspro is trying to say, you can see the fractional odds here when moving the cursor over the odds .
  To get this you just need to tick the  "Display fractional odds on mouse-over" box which is located under more options and then odds options.

doesnt work for me, i have firefox though?

Ok, I use IE so don't know about Firefox.   I would have thought it should work on that as well ?

Doesn't work for me in IE or Firefox....

It certainly works with IE here.   You have to be accurat with the cursor though. 
  It's not enough to put it over the price box. You need to put it over the price itself.

it's got nothing to do with the browsers

with the market open go to "more options"

and

check "Display fractional odds on mouse-over"

It's got everything to do with the browsers.

With that option checked, and running IE & FF side-by-side, IE gives fractional odds on mouseover, FF doesn't.