Next, I found two example pages for reference. Here is a page using the full-width page template:
http://thegoonermonkey.wordpress.com/arsenal/

And here is a recent post:
http://thegoonermonkey.wordpress.com/2013/06/10/monday-news-round-up/

I noticed you already have this custom CSS to hide the right sidebar on single posts:

.single-post #tertiary {
	display: none;
}
.single-post #content {
	margin-right: 0;
}

You can do the same thing to the left sidebar (#secondary) and set the left margin to zero to get an effect that's more like the full-width page template. In addition to the CSS you already have, add this:

.single-post #secondary {
	display: none;
}
.single-post #content {
	margin-left: 0;
}

Note, for other users who might visit this thread: this is for the Skeptical theme.

.single-post #sidebar {
    display: none;
}
.single-post #main.col-left {
    width: 940px;
}
.single-post .post .middle {
    margin: 0;
    width: 719px;
}
.single-post .nav-entries, .post-entries {
    width: 719px;
}
.single-post #comments {
    width: 940px;
}
.single-post #comments .comment .comment-container .comment-content {
    width: 799px;
}
.single-post #comments .comment.depth-2 .comment-content {
    width: 774px;
}
.single-post #comments .comment.depth-3 .comment-content {
	width: 749px;
}
.single-post #comments .comment.depth-4 .comment-content {
	width: 724px;
}
.single-post #comments .comment.depth-5 .comment-content {
	width: 674px;
}
.single-post #comments .comment.depth-6 .comment-content {
	width: 649px;
}
.single-post #comments .comment.depth-7 .comment-content {
	width: 624px;
}

Does anybody know how I completely delete the link in the header image I am using Skeptical theme?

Thanks.

Is there an easy visual way for readers to see popular or recent posts (with photos) without having to scroll down in date order?

Or can you suggest another (user friendly) theme that I can use for the above

I want to keep my customised header & if possible the customised background.

The blog I need help with is
http://kalizamar.wordpress.com/

Many thanks

In addition to the other work-arounds that have been mentioned, you can force the standard format by choosing the text option from the new post menu rather than the photo option. This allows for the creation of a titled post into which the image can be inserted as the 'text' content.

I already posted the items and after a while i found out that the title did not show up. I tried all of the suggested sollutions, but none of them worked :(. @justpi I tried the ones you suggested, like changing the format into chat. But that also did not work. Is that because I already posted my posts and then tried to change them afterwards?

zoektengijzultvinden.wordpress.com --> six word stories.

Should I open a new topic about this subject? I have the same problems, just a different theme.

i have just posted my blog and your solution worked! i am so grateful to you.

it is a shame that wordpress's own tech experts did not give me this info.

I really appreciate your insight and information. I post on Mondays so am looking forward to applying your advice.

"I did reply to the staff and did not get an answer other than the one I described."
I mean you should reply to that answer.

"I even wrote the designer and he had no idea how to help".
Once a theme is adopted by WP and adapted for wp.com, its original designer has nothing to do with it.

"I received a response from support but it did not acknowledge that the vertigo theme had worked perfectly until it suddenly had problems."
WP changes things all the time. And this quirk is neither a bug nor limited to Vertigo: it has been introduced intentionally.