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No! And it’s not function.php, it’s functions.php. This might be the reason why your functions.php wasn’t read. Because it didn’t exist. You created function.php instead.

The important things about functions.php of you child theme are that:
1. It has to have <?php on first line and ?> on last. So, an empty one would look like this:

<?php

?>

2. It shouldn’t have any function contained in parent file, with the exception of pluggable functions, which is of no interest to us here.

Just put the code inside those lines and save it as functions.php. And upload. And you’re done.

You got it right.

There is absolutely no way for this function to know where you want your link to go. You have to put your link (as HTML) inside the $credits variable. As in:

$credits = 'Custom Design by <a href="https://twitter.com/PollyPirate" alt="follow meh!">Polly Philipson</a>';

AFAIK, no one posted page templates for WooCommerce & Customizr. However, I have recently contracted development of an online shop, for which I intend to use WooCommerce and Customizr.
After I’m done building them, I’ll make the templates available for download, probably through the snippets system on Customizr’s website or through the use of a WP plugin, haven’t made my mind up yet.

If you can’t wait for a few weeks and since Customizr is built on Tweeter Bootstrap, here are a few good layout examples using the built-in TBs library.
Please note that Customizr uses TBs 2.3.2 library, not TBs 3. So if you decide to look the web for more TBs examples, make sure they’re compatible.

1. Log to your site through ftp and add a _ before your child theme’s name.
2. Log into WordPress.
3. Activate Customizr.
4. Change your child theme’s folder name back (remove the _).
5. Add a _ in front of all files of the child theme, except style.css and functions.php.
6. Activate child theme.
7. One by one, remove the _ in front of your child theme files and see which one is causing the error. There may be more of them, not just one.
8. Once you found one, get the new version of it from Customizr, re-apply your mods and save it instead of the child theme version. Than back to step 7, until you finish all files.

If:

• you have put the function inside functions.php of your child theme,
• your child theme’s functions.php is not a modified copy of it’s parent counterpart (read on how to add child themes if unsure),
• your child theme is the active theme
• you have put the html contents of div.container.marketing in between the backticks from line 3 in that php code above (in $extra_fp_html variable)
• and your html doesn’t contain any unescaped backtick…

…it should work.

At this point it’s quite clear to me you have set out to modify this theme way beyond your coding skills. I have given you all the elements to achieve your goal, yet you missed some detail. I’d try again if I were you.

Trust me, the function works. Just tested it here, to make sure: http://customizr.websiter.ro.

On line 83 of your child theme’s style.css you need to lower that 313px down a bit. Replace that line with:

padding-left: 40px;

If you want to right align the links in that widget, add this to your CSS:

#text-4 .textwidget {text-align: right;}

Do you have the same font-weight problems when viewing the Customizr Theme Homepage or this test website?

In not, let’s try to pinpoint where the line of code that produces it is. First, remove all code from custom CSS (save it somewhere, so you don’t lose it). If that fixes it, I’ll have to ask you to post that code here between two lines containing only one backtick each (`), so it shows up in a code window.

If the error is not in the custom CSS, try re-installing Customizr fresh. If your problem is still not solved, you need to start looking inside your child theme.