Want to change logo on a page

So you edited your previous post to remove your reference to FAVICON. Good move.

.post selector is for posts.
Then what you want, maybe, is:

.page #main-wrapper h1.format-icon:before {
content: url(https://www.eifco.us/wp-content/uploads/2014/02/wpbt-logo.jpg);
}

You can also use a .ico there.

Yeah! that is what I wanted! but why does that picture appear now “shaded out”?

add this property to the code above

opacity: 1;

within the bottom bracket I presume (as below)?

.post h1.format-icon:before, .post h2.format-icon:before {
content: url(https://www.eifco.us/wp-content/uploads/2014/02/wpbt-logo.jpg);
opacity: 1;
}

Within the brackets yes.