Attitude: remove date & time on comments

Can anyone be so kind to help me what code should I type to remove date and time on the posts, comment and replies? I found a box titled, Custom CSS. This is under Theme options -> Design options. Can I add codes in there? I’m new to scripting and programming, I would really appreciate your help.

Here’s the progress of my work: https://www.mintcreatives.com

Thank you for your patience. ??