PhpMyAdmin is quite different application compared to the above video. In the video, I have described how to increase your default memory limit in cPanel. Above video doesn't have any relation to PHPMyAdmin.
PHPMyAdmin is a tool integrates with MySQL, Which executes DML, DDL commands.
For more details, follow the article below.
Also, Your question is unclear. Try to elaborate your question more specific. So that, I could provide you the best solution.