How to make an iPhone 5 case fit an iPhone 4S?

I have an iPhone 4S and today I bought this really cute phone case from H&M, it's silicone and glows in the dark! The thing is, once I took it out the packet and started to put it on my phone, I realised it's for an iPhone 5. --- It says it on the back in TINY writing. Does anyone have any suggestions on how I can make it work?

Well its just a matter of acceptance that it was a big mistake. You can't resize a case that's meant for iPhone 5. Unless you can find a store that repairs things like that.

I you sure its an iphone brah? And not a potato? Because I've made this mistake before

Return the case and find one that is made for the iPhone 4S you can tell which case is for what phone by looking at the bottom or looking at the front of the packaging. It should say which phone it's made for.