Installed CiviCRM in Wordpress via ftp, but it doesn't appear in plugin directory
I believe the issue might be what Lesley is pointing out at the end of the comment, regarding the folder structure.
In order for WordPress to identify a plugin, the plugin shouldn't be in a sub-folder, it could have happened that depending on the zip/unzip software you have used to extract the plugin, the civicrm folder (inside your /wp-content/plugins folder) might look like:


civicrm-4.6.8


civicrm


civicrm.php
uninstall.php
civicrm
includes
assets
...




When it should look like:


civicrm


civicrm.php
uninstall.php
civicrm
includes
assets
...