Unable to select 'do not log' on Blacklist

[Jasmine Hardy]

I have a number which I really really really want to block, and I don't want any logs or to be notified at all if they've tried to contact me. In the description on the Playstore it says there is an option to 'not log the SMS and calls', this is what made me get the app in the first place. I blocked the number, went on settings for the number. But for some reason I cannot even select the drop down menu when it comes to picking an option. Arghhhh why won't it work?!