How to remove comments and dates

Hey Anders! I would like to thank you for such a nice theme and it’s for free. ??
I have to say that this is my first word press site, and that I’m still working it out. I want to ask is it possible to remove date on posts and comments.
Like here https://dcnovisad.org/dc_sajt/?p=12 under the title of the post there is “Posted by dcnovisad_wp_username on April 23, 2015” and next to it is comment count. After the post there is grey bubble like saying who wrote the post, and on the bottom there is comment form. I would like to get rid of all of that. Is this possible?