Disclaimer that I haven’t actually done this, but I’d assume it’s as simple as plugging your turntable into one of the channels on the back, changing the channel to PHONO input, then make sure your channel trim is turned up nice and loud without clipping into the blue so your recording will have a good clean signal
Then you can just use the built-in recording function to record a WAV file of the record as it plays through
Optionally you could also use something like Audacity to split up the recording into individual tracks, and maybe remove dead air from the start/end of the tracks.
Then you can use a tag editor like Mp3Tag to add proper metadata, album covers etc. to the track files