First, go to the html page and add this below the last custom link

<br>
{block:Pagination}{block:PreviousPage}<a href="{PreviousPage}">«</a>{/block:PreviousPage}{block:NextPage}<a href="{NextPage}">»</a>{/block:NextPage}{/block:Pagination}

Add also the links to return and the link to this blog.

Then delete this part:

<div id="div" style="position: fixed; padding:2px; border-right: 5px solid #000; line-height:12px; width:50px; z-index:2; left: 500px; top: 510px; background-color:white; color:black; font-size:15px; text-align:right ">

<a href='/'>Return? </a><br>
<a href='/ask'>Ask</a><br>
<a href='http://cinneria.tumblr.com'>Theme</a><br>
{block:Pagination}{block:PreviousPage}<a href="{PreviousPage}">«</a>{/block:PreviousPage}
{block:NextPage}<a href="{NextPage}">»</a>{/block:NextPage}{/block:Pagination}
</div>

p.s.: DON’T delete the second div

Wow, thank you so much xD Let’s see if I can help you

 Go to the html code and replace that ↓

<center>{LinkOpenTag}<img src="{PhotoURL-500}" alt="" >{LinkCloseTag}</center>

by that ↓

<center>{LinkOpenTag}<img src="{PhotoURL-500}" alt="" width='500px' >{LinkCloseTag}</center>

Was that what you asked me? :p 

Certo o/ se tiver qualquer problema com ele, me avisa :3