For all those other members having the same problem like mine(user picture not showing), jus copy that code as mr.fplonque sayz from the default skin and then paste it anywhere u like inside single.main.php file of any of yo favourite skin.
Thanks Mr.fp.lonque.

<p class="postmetadata alt">
			<small>
				<?php
					$Item->author( array(
							'link_text'    => 'avatar',
							'link_rel'     => 'nofollow',
							'thumb_size'   => 'crop-32x32',
							'thumb_class'  => 'leftmargin',
						) );
				?>
				<?php
					$Item->issue_time( array(
							'before'      => /* TRANS: date */ T_('This entry was posted on '),
							'time_format' => 'F jS, Y',
						) );
				?>
				<?php
					$Item->issue_time( array(
							'before'      => /* TRANS: time */ T_('at '),
						) );
				?>
				<?php
					$Item->author( array(
							'before'      => T_('by '),
						) );
				?>
				<?php
					$Item->categories( array(
						'before'          => ' '.T_('and is filed under').' ',
						'after'           => '.',
						'include_main'    => true,
						'include_other'   => true,
						'include_external'=> true,
						'link_categories' => true,
					) );
				?>

				<?php
					// List all tags attached to this post:
					$Item->tags( array(
							'before' =>         ' '.T_('Tags').': ',
							'after' =>          ' ',
							'separator' =>      ', ',
						) );
				?>

				<!-- You can follow any responses to this entry through the RSS feed. -->
				<?php
					$Item->edit_link( array( // Link to backoffice for editing
							'before'    => '',
							'after'     => '',
						) );
				?>
			</small>
		</p>

*edit to add [php] tags