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The plugin did not activate and gives a fatal error "failed to open stream: No such file or directory"

All plugin files must be in the wordpress plugin file directory wp-content/plugins in folder "refer-notes". Spelled exactly. Can not change this name.

I am using a local server and the plugin does not appear to be working. Whats wrong?

The plugin does not work for local servers. A testing option may be added in the future to allow simulation of referrals.

The plugin activated and appears to work fine but I can not get it to display a message even when I know it should."

Check to make sure that your theme is using the wp_footer and wp_head tags. These tags are located in each specific theme in the header and footer files. In the header file the code <?php wp_head ?> should be located between the tags. In the footer file the code <?php wp_footer ?> should be directly before the tag.