help me understand

I'm totally new to this app and trying to convince. App says I would be ovulating on May 24th I took some ovulation test. One on the 22nd of may and the other on the 23rd of may. First thing is was the one on May 23rd positive? Also how many days am i dpo? When's the best time to test?? 
Here's the one from May 23rd.
Here's from May 22nd.