Q: how do i delete apps off my iPhone 6

1. Press down on the app with the finger tip till the apps start shaking and have an X - tap on the X to delete the app

- One cannot delete certain Apple pre installed apps like Mail and Notes for example

2. If you do not see the X and the apps are shaking -

Press home button to return to baseline state

Settings - General - Restrictions - deleting apps (should be white/ OFF)

Since you mention the MBP - you can also use iTunes if you would like

Delete music, movies, apps, and other content from your iPhone, iPad, or iPod touch - Apple Support