HTC One M8 :: How TO Turn Off Or Cancel Lockscreen

I have an HTC One m8 which I purchased from T-mobile about four months ago. I was originally running the HTC BlinkFeed launcher, tried out the Google Now Launcher, experimented with some other launchers, but am now pretty much settled on the Nova Launcher. At some point during the last month (January) I set up a lockscreen which requires a PIN to give me access to my home screen and other pages.

That has turned out to have been a dumb move for me. I am physically disabled with cerebral palsy since birth (I am now 66). My arms, hands and fingers are pretty rigid and often spastic (stop giggling you kids). I can swipe my hand from left to right to clear the first screen and get access to the screen which presents the screen I must use to enter my PIN. Using the hunt and peck typing system I then enter my PIN. This process has become tedious and I real pain.

How can I do away with the PIN and lockscreen?

Recently I downloaded an app (whose name I cannot recall) which I thought would cancel the lockscreen and PIN. Instead, it gave me yet another lockscreen to deal with! So now I have to

(1) clear the first screen with a hand swipe,
(2) enter my PIN,
(3) use another hand swipe to clear this newest screen, and only then get access to my phone.