Downloading an app for my iPhone?

I tried to download stumble upon to my iPhone 5s and it hasn't finished downloading and it won't let me delete it from my screen, it has been like this for 3 days

Try a Reboot for your phone by turrning it fully off and then back on.
Then delete that app and try again if desired.

Turn off your phone.
Press your home button and on/off button together until your phone (by itself) turns off. Then, after like 5-7 minutes, turn it on. And see if it helps. Otherwise, tap on the app icon to see if it starts to install. Or check your Wi-Fi connection too. Sometimes, due to bad Wi-Fi connection, apps fail to install and then stay as they actually are. It's not a big problem. Or go to AppStore, type in the same name, and check if there's an option of installing there. Try all these. Hope this helps. X
And I have an iphone problem too. It says I have 98 videos whereas I only have 14. It is even occupying my memory. What to do?