When to take ovulation test?

Hi lovelies, This is my 1st month that I will be taking ovulation tests(Clearblue digital). Currently I am on CD7. - So when to start, at what time of the day,( I drink water like a fish meaning I use loo pretty frequently) for how long I have to hold before testing and Ido i need to drink less water?

Sorry if my questions seems stupid 🤪😬

TIA