Now I have a problem as I decided to take out a sub to FindMyPast a year or so ago, but basically if you go onto the first page of the Census you want and don't fill in your details, you should be able to click and bring up the towns you need, then click on them. Sorry I can't be more helpful than that. Someone else will give you much better directions at doing it. But you can then look through the Census street by street, which is very useful.
Regards
Derby Girl