Clear Blue Advanced Digital Ovulation Kit

Hi ladies, newbie here with a question...

My period was 5 days late so I reallllly thought it was my month, but unfortunately AF showed up last night. Seeing that negative PG test made my husband and me realize that we’re ready to make a true effort in ttc. I’m looking at getting the Clear Blue Advanced Digital ovulation kit. Since I’m just starting off, I figured I’d try the (hopefully) simplest way first. I’m on day 2 of my cycle- when do I need to start using the kit? I need to purchase it and want to make sure I don’t miss my window of opportunity this cycle.

If anyone can give me the Clear Blue Advanced Digital ovulation kit for dummies breakdown I’d REALL appreciate it.