just for the reference:
To properly close span tag in single.php in propulsion theme we need to move the last bracket just before the last semicolon at line 49.
before:
<?php previous_post_link('<span class="previous_post_link">← %link </span><span class="post_link_text">'.__('(previous entry)'))."</span>"; ?>
after:
<?php previous_post_link('<span class="previous_post_link">← %link </span><span class="post_link_text">'.__('(previous entry)')."</span>"); ?>
Create a new thread and tell me what problems you are encountering and what you want to know. 
There is no step 3 :) 
