Customizing WP comment form

I know that this is the php code I need to change (see below)

<h3 id="reply-title" class="comment-reply-title">Leave a Reply <small><a rel="nofollow" href="https://a-vessel-remade.com/referrals-resources/?customize_changeset_uuid=cf3f8965-f6d1-4b3e-9555-e8fa67ce035d&customize_theme=elegant-pink-pro&customize_messenger_channel=preview-1&customize_autosaved=on#respond">Cancel reply</a></small></h3>

And these are the changes I want to make (to all comment forms on my site, not just where my page referrals-resources is listed in the code above).

1. Change the words Leave a Reply to Comments/Suggestions/Questions
2. Change those words (title) to color #dc0852
3. Change the words Post Comment in the submit box to Submit
4. Remove Website entry field
5. Edit checkbox statement to say: Save my name and email in this browser for the next time I comment.
6. Lastly, remove that small checkbox at the bottom that serves no purpose

My problem is I do not know how to change a php (which is HTML I think) to a CSS code (for adding it in customizer) and I don’t know where to add a php code at if I did figure out how to edit all that I want in the php code itself.

Can you help, please? I see the needed php code in inspect mode, but I do not see it in comments.php or in style.css, so I am lost.

• This topic was modified 4 years, 10 months ago by bcworkz. Reason: code fixed

The page I need help with: [log in to see the link]