Keyboard:
1)If it's wired,Just plug it into one of the usb ports on the console and follow through,If it's wireless,Go to step 2.
2)Plug your USB/Bluetooth Receiver for Keyboard into one of the ports and go into settings,Then into Devices,Then Bluetooth Devices,Your PS4 will start searching for a nearby device.
NOTE:This may take a few tries.Keep at it.
Phone:
Keyboard may be ideal but a phone is more convenient.
1)Go into your respective app store and download the playstation app.
2)Once it's downloaded,Open it and log-in with your PSN ID.
NOTE:Make sure the PS4 and Phone are on the same network.
3)Select the second screen option on your phone and choose the keyboard icon in the corner.
Hope it helped PS4 is kind of running low on tutorials so this is all I got.
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