Radio head unit Skoda roomster 2 - 2007 1.9tdi

Hi all, so I purchased a new radio head unit that fitted my wife’s car, now I have seen many posts that wires have to be changed around for preset memory, I am a quite a novice so could any kind person please advise what wires I actually need to change or spice to enable the head unit to retain the memory of presets, I’m still figuring out why the CarPlay keeps disconnecting and the WiFi radio switch keeps turning off, the head unit came with all the correct connections, and has a rear camera and steering wheel controls which I don’t need, i guess there have been many posts in the past but searching without the correct wording is very tedious, I have what I believe followed all the instructions but to no avail, also do I need to change any setting with the canbus connection that came with it as well, I know this seems long winded and a few things but I am struggling to find the info I need, thanking you all in advance