As supplied this module has a bug. If you install the module and put in the left column it will show the site but only up to the point at which this module is displayed. Afterwards however, it stops the rest of your website from appearing leaving you with a blank screen elsewhere.

Initially, having found this problem I put it in the right hand column right at the very bottom. It was then OK as my site had already been drawn prior to reaching this module. So you can use it as is, as long as you put it as the very last module on the right hand column...

Looking at the code I see that it uses the tag but it does not close it off properly
You need to edit /modules/mod_exchangerates.php

It is not the prettiest of modules and you will have to modify the colours and layout yourself using your Dreamweaver/Frontpage skills.

Apart from these niggles and glitches, it does the job and as such I would recommend it. If the glitch could be fixed for the next version and some configuration added to allow you to set the default currencies to convert then it would be a worthwhile and useful module.