You want to create a Template in your theme, and somehow you don’t have FTP access in that moment. But, hey, you have the WordPress logins to enter in the backend, so… stay tuned!
1 Indentify the theme directory
To know the directory in which the theme is located, you will need to see the source code in the homepage of your website and search “/wp-content/themes/“. The search will show you the full path to your theme, would be something like “http://example.com/wp-content/themes/YOUR_THEME/style.css” or whatever.
We only need to copy “/wp-content/themes/YOUR_THEME/” to the clipboard.
2 Create the File
In your WordPress backend, go to Appearance > Editor, open “header.php” and paste the following code into it:
<?php touch('wp-content/themes/YOUR_THEME/tpl-template.php'); ?>
Of course, you need to modify the path with your specific needs.
Now, go to your homepage and go back to the backend to delete the line you just wrote.
3 Edit the File
Like magic, the file now will appear in the right side of the editor. So now you can edit it to create a new and fresh template!