Hello Lark and welcome to the forum!
It's possible that nothing is wrong with your plants. They could just be in shock from the recent moving around (assuming you got them less than 2 weeks ago). How long ago did you get them?
For basic care tips, you should read here:
http://www.flytrapcare.com/venus-fly-tr ... alive.html
Basically the most important things are:
1) Lots of sun
2) Clean water (rain, distilled or reverse osmosis water only)
3) Nutrient poor soil (peat moss works well)
4) Dormancy
With regards to 4), where do you live? If you live in the northern hemisphere, it's likely that your plants are going dormant and that's why you aren't seeing the growth that you'd expect.