This is a two-part process.
1 of 3 – Database Removal
In your web hosting control panel, remove/delete the MySQL database containing the iDevAffiliate tables/data. If needed, you can use FTP to edit/view the API/database.php file. That file contains the database connection details and will show you the database you’re connecting to.
2 of 3 – Files/Folder Removal
Using FTP, remove the folder where the iDevAffiliate files are located. This includes the folder itself and all the files in it.
3 of 3 – SEO Code Removal
If you are using the SEO links, you will have mod_rewrite code in your .htaccess file. Using FTP, edit that file and remove that code.
That’s it. iDevAffiliate is not uninstalled/removed from your website.