Can you post a link to your website with this theme?

Did you meant Mobilize plugin?

If yes then you can save all your changes in mobilize\views\mobile\css\mobilize.php

no, I use mobile plugin ....firstly tried mobilize but user couldnot find profile page in menu...so I use mobile and i dont know where css file...

There's not only a single CSS filte. There are several. Just look into the subfolders in mobile/views/mobile/. Firstly, there's a css folder that contains several css files. And some of the other folders also contain css files.

But the mobile plugin is no longer maintained and the developer mentioned himself that it still contains some bugs. As I already suggested in the discussion about the Facebook theme, it would be better to upgrade to a newer Elgg version instead of being stuck on Elgg 1.8 with plugins that no one maintains anymore. With Elgg 1.9 and newer you also get the Aalborg theme already as a bundled plugin. This theme is a responsive theme that will also work nice on mobile devices out of the box.

You need to copy the existing file from mod\thewire\views\default\object\thewire.php to your own plugin's folder like as mod\your_plugin\views\default\object\thewire.php

Then change in this file:

$author_text = elgg_echo('byline', array($owner_link));

on

$author_text = $owner_link;

It works thank you...I have a nother error when users click like in mobile website they got undefined ...have you solution for this ..thanks in advance.