Lensa theme customisation please help

Hi people…I am absolut beginer in WordPress. I instaled it on my site and now i have a problem to find some options to customize this Lensa theme…I hope someone will have time to help me.

The url of my web page is https://www.arvinproduction.com/

and here are the problems:

PAGE ABOUT – how to remove text LEAVE A COMMENT and everything below. I do not want comments

PAGE WORK CONDITIONS: I want to have on this page only this title and some text below. But, when I am in dashboard/pages and on that page type some texts in field where it should be, there is not visible text on that page. Yes I did hit Update button..Hmm??
Also tryed to change Layot and nothing!

PAGE:PORTRAITS: again I have LEAVE COMMENT!?/ How to remove it? And this TAG CLOUD, ARCHIVE and BLOGGROLL form right side?

PAGE WEDDING: same problem as page above!

PAGE CONTACT: I dont get emails when sending using contact form below! Anyway I did not at all found where I can set email adress at which I will receive messages sent using this form! How to adjust that?

Thanks a lot people for help