To remove numbers from the call log that you don't want anyone seeing, then open your Call Log.
This will normally be found on your Apps list or you can also go to your Dialler and find Logs or Call Logs.
Then press and hold on the contact you want to remove. When the Menu appears, press Delete.
I have for example a person that called me 5 different days, how do I delete all 5 of those at one time? you would think it would show all calls from that one contact/person