Firstly, in the future do research on E V E R Y T H I N G you buy B E F O R E you buy it. You'll find you have really great results that way.
We need to know what lighting you have and what size tank you have and all your current tank levels - temp/salinity/nitrate/nitrites/ammonia/etc etc this are important to help figure out whats going on with your livestock.
On a side note... anemones sometimes look dead.. thats just one of the many strange behaviors anemones have. They often shrivel up into almost nothing and soon after they are full and beautiful again. Before I get too ahead of myself though.. please give us that info and a pic would also be helpful if you can take one.