Next choose Add A Gadget to whatever blog section you want the module on.
Scroll down the options available and click the plus sign for Translate.
You will be given 3 style options to choose from. You can also change the Title. It doesn't have to say "Translate." You can always change this by picking Edit on the Design panel.
And here it is on the bottom of my blog! Now I do know that when I sometimes visit people with the Translate option, their little box has disappeared but I think that's a blogger defect though.
Anyway, to you international readers; welcome and I hope this makes things easier for you.