How to add a ReadMore link to single post in index template

Hello fellow wordpress users.

My theme when I use the more tag vuts the post in index as intended, but does not leave a messageand link like “Read more…”

I would like to correct this situation but don’t know how. Browsing through WordPress documentation I realise it has something to do with “the_content” function.

I searched in my theme code and found the following:

In the fn-general.php:

[ Code moderated as per the Forum Rules. The maximum number of lines of code that you can post in these forums is ten lines. Please use the pastebin]

And in Index.phf this line only concerning the_contect function:
<?php the_content('',FALSE,''); ?>

I belive the solution to the problem resides somewhere along this lines, but i tweaked several times with it and it nevers shows the message inteded of “Read more”.

If someone knows how to solve this I would be eternally grateful!