How to put "posted by" link along the posts?

I am now building a new wordpress site. I have selected a theme.
The theme i use doesn't have the "posted by" link in it. I need to add it.how to do it?

I will be allowing multiple authors to post so i need to make a profile page for each authors. How to make profile page and how to link the page with author's name?

Please help me,
Thanks

 

In index.php, under the post title code, put Posted by <?php the_author(); ?>

You can make it a lot more fancy than that:
http://codex.wordpress.org/Author_Templates

 

do i need to create author.php?
Is the "index.php", you said here inside the template folder?

 

Nope... "author" is not a page... but a variable which is already store in your database. You are just "asking" for this variable to be posted on your page.

Yup... that would be the correct index. You can also edit it directly from within your wp-admin dashboard. Its under Design --> Theme Editor.

 

If author.php is not found, Wordpress uses archive.php for the author pages.

Also, every theme should have index.php and style.css.

 

I read one of the online blogs and created a author.php file, and linked it in the main index.php file.
Now i can see the posted by link in the main page but when i click the post and go to the post page, the link is not there.
So where should i actually paste the code ? and where is "under the post title"
I don't know anything...please help me...thanks

 

Download a few themes and see how they do it. The BloggingPro theme is a good example:

<div class="PostHead">
 <h1 class="title"><a href="#"></a><a title="Permanent Link to <?php the_title(); ?>" href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h1>
 <p class="PostDate">
   <strong class="day"><?php the_time('d'); ?></strong>
   <strong class="month"><?php the_time('M'); ?></strong>
 </p>
  <p class="PostInfo">Posted by <?php the_author() ?> as <em><?php the_category(', ') ?></em></p>
</div>

Code (markup):

 

I tried this just now and it worked for me. However, I removed it again as it looked weird due to big space being used. Thanks for sharing, though.

 

Thanks, Its working fine now, It was the template that caused the problem. I changed it and now added it to every page.