Joomla! Template AGROnomy PT - Item Support

I bought this template, but I'm struggling to do the login menu and another to register, please explain how I put exactly the same as the demo of you and how they appear as a new window in the middle of the screen! grateful
I have this template and am having problems with render image on the site! I trigger all the times I have the module for this function (independent of the module) and the page that it should suffer the reduction of the image is completely white! How can I fix it!
I have a problem to make the friendly url's on my website, however I know it is not a problem with the template agronomy, but I'd like you guys to help me in the following error: 500 php regular expression Limit Reached (pcre.backtrak-limit) I researched about it and made ​​the alteration of boundaries with the inclusion of two new lines in the file configuration.php, however the result was negative. I think you guys have a great experience in joomla and I think you guys could help me, I need to do something to fix, because my site to stay in operation have to disable the friendly URLs. The problem is all in one system downloads with several subcategories (essential to my site), using module / component called jDownloads. Please help me!
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