I can't delete albums in my photo gallery?

So I imported some videos from my Macbook to my iPhone 6s+ (if the model helps) and I wanna delete those videos because I no longer need them. The thing is, I can't delete them? They're in an album called "Last import" and "Last 12 months". Every time I try deleting them, there isn't an option to delete the videos or the album at all. Please help? What do I do to delete these videos and album?

"iPhone 6s+… Some videos from my Macbook… I want to delete those videos"

On the phone touch "Settings", touch "iCloud", swipe to the bottom, and touch the red "Sign out".

Delete your videos.

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