How to uninstall a permanent app?

Actually it wasnt permanent before, the other day I found a youtube .Bar file on the internet n when I sideloaded it using chrome, it did install but it isnt getting uninstalled, the UI of the app is very cheap and even the video quality in the app is very poor, the videos lag even while using a 50mbps internet connection. Lags in the sense it is played normally but the fps of the video is 3 or 4... please can anyone suggest me something about this beacuse i dont want to crowd my phone's storage. it will be a great help if anyone tell me how to uninstall... thanks!! :)

Mentioning your model would help, but bb10 users can use Sachesi to find the install and remove it using a pc.

If you're using the chrome plugin I think of, go there and look for the app, then click the uninstall button.

Did you try to delete the app from the phone's device monitor first?