Help :)

Hey! So I'm going to try opks next cycle and I was wondering if someone could explain in detail how it works... do I pee on them everyday following the end of af... how do I know if it's positive, what does that mean for bd'ing- like when do I do it.... I track on glow and another app currently, so I know roughly about my fertile window but hoping for a more exact time to do the deed... PLEASE HELP!!!! These are the test strips I just ordered if anyone has used them or has any input or advice I REALLY appreciate it!!! 😄😄 thanks!!!!