How to add next and previous links to post

I would like to add a navigation into a post to get to the next and previous post of the same category.
I added the tags

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<?php previous_post(); ?>    <?php next_post(); ?>

in the content.php,

Question:
1. Where do I have to add them, so that they appear only AFTER calling the whole post with the "read more" button?
2. I'm not able to get the tag "posts_nav_link" working
3. there is a tag

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<?php gk_post_links(); ?>

in the content.php. Is this the same, how can I activate them?

Hi,

gk_post_links is for displaying post pagination by default. Are you sure that you correctly insert <!--nextpage--> tag into posts (use text editor and for sure type this tag, don't copy it from e.g. another website).

Please don't use previous_post() funciton - it's deprecated, use these functions instead (in content.php file, before gk_post_fields function):

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<?php previous_post_link(); ?>   
<?php next_post_link(); ?>

Thanks Piotr,
previous/next_post_link works fine.
Is there any possibility to set this link by default site wide with the theme design? I'm not too familiar with the intagration of a style to a php function...

I do not use <!--nextpage-->, I prefer <!--more-->

What exactly do you want to do with these links? (previous/next), Could you provide an URL to your example post (here or via PM) and then I'll try to help you to add styles..

Thank you; I wanted to add the possibility to go back to the previous post of the same category/next post same category directly out of the individual post.
I added

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<p><?php previous_post_link('%link', 'Vorheriger Beitrag', TRUE); ?>  |   
<?php next_post_link('%link', 'N&auml;chster Beitrag', TRUE); ?></p>

Problem solved, except the style, but this is no problem so far.

http://www.wiese-eg.de

Cheers
Tobias

You can add this code to css/override.css file to align "next post" to the right:

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.content a[rel="next"] {
   float: right;
}

Great! Thank you