I've started running pop but I cant figure out how to use Livesplit for il runs as the category list doesn't include them

You could use transition timers in the setting of HKsplits if you do need a in-depth explanation fireborn has a playlist to help new runners

I recommend downloading the premade splits for PoP from HK Split Maker: https://hksplitmaker.com/?builtin=pop does most of the work for you.