Okay, step 1: I opened the page in FireFox and IE, and I can see the footer in each. So far, so good. The single-entry page looks correct, too -- I can see the comment area on both FireFox and IE.
Now, the entries.tpl. This is where you'll have to make the modifications. There's no help for it, unless you want to totally rework your CSS to use absolute positioning or something (OMG, please don't).
Here's what's going on:
The entries.tpl is a kind of code known as
Smarty templating. You can think of it as code, if you're familiar with any kind of programming.
Smarty gets mixed in directly with HTML, so we need a way to distinguish between the Smarty stuff and the HTML stuff. If it's {surrounded by braces}, it's something Smarty does. This can be as simple as printing a value like {$CONST.POSTED_BY}. It can be more complex, like making a decision, or looping through all the available entries.
To make a decision, Smarty uses {if}. You might say "{if I really want to print this}Print all this stuff.{/if}" for instance. Note that Smarty uses / just like HTML, to mark when we're done talking about a particular block of stuff.
To loop through all the available entries, Smarty uses {foreach}. Of course, there's a matching {/foreach}. You won't be needing it for your project, but it's nice to understand what you're looking at.
In your entries.tpl, Smarty starts by looking at each date ({foreach from=$entries item="dategroup"}). It probably prints a date header. Then, while it's still looking at this date, it looks at each entry for this date ({foreach from=$dategroup.entries item="entry"}). Now it's going to start printing the stuff for this entry.
In your template, it probably starts with a <div> for the serendipity_entryFooter. If this comes right after the {foreach}, or right after the serendipity_entry div, you're golden. Just cut everything inside the serendipity_entryFooter div, including the <div> and </div> tags themselves. (If it's inside an {if} or something like that, you'll have to decide if you want to take the whole {if} block, too. It depends on what's in there, and how much you want to move.)
If you save the template and reload the page now (might have to clear your browser cache), the "footer" should be gone!
Now we just need to paste it where we want it. Find the serendipity_entry div. This will contain the ENTIRE entry, including its header, content, extended body, and footer (which we just removed). Move past the header and content. Find the end </div> tag for the serendipity_entry div. Paste the serendipity_entryFooter just ABOVE the serendipity_entry end </div> tag, so the serendipity_entry contains the serendipity_entryFooter.
If you save the template and reload the page now (might have to clear your browser cache), the "footer" should now be below the entry body. Woo-hoo!
You can use this technique to move stuff anywhere within the entry you like. The entries.tpl defines what the list of entries will look like, including what each individual entry will look like. If you want to mix up the entries, this is where you do it. You can also change their order, indentation, or background coloring; you can insert Google ads; you can number or bullet them; you can remove the ones you don't like, or the pieces you don't like. (Don't want a "date" separator? Yank it out!)
I can't find the Hemingway template anywhere, so if you need more detailed help, you'll have to provide either code examples, or a link to the template so I can look at the entries.tpl myself.
Good luck!