Wordpress: How to change page name from ?page_id=2 to "about me"

Here's a possible solution:

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Use this information AT YOUR OWN RISK. Backup Your Database before making any changes.
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Take a look at the Database Table: wp_posts

You can access the database via cPanel > phpMyAdmin

When phpMyAdmin first opens, you need to click on the correct database name.

On the left column, you should see the table called (table prefix)_posts, where "table prefix" is usually "wp_" by default, unless you changed it in your wp-config.php file.

Click on that name, it will show you the pages of your site. You may need to search for them if you have a lot of pages or posts.

To search, go back to the root area of the database. (use the breadcrumb links at the top, or just click on the database name again.) Then, click on the "Search" tab at the top of the page (in phpMyAdmin).

Once you found that page, click on the pencil icon to edit it. Look for the "?page_id=" string.