How to delete apps from Iphone?

I pressed and held but the x did not show up. I went to Settings, general, usage found the app I just added from the app store, but there's no place to delete it? It is NOt a built in app, I just added it myself. It's the 5-0 Radio app. I added from my phones app store so It's not on my itunes account so I can't remove it that way. Can anyone help me?

If it is an app downloaded from the appstore, it should be fine you hold down on the app for 3 seconds
if it is a jailbreak app like cydia, it can't delete:/

Restart the phone and try to delete then. Something went haywire during downloading. Like it's incomplete or something. Best luck.

Restart ir!

Restart and try again.

Reset and try again.