Perhaps you are using phmpmyadmin from (MAMP / WAMP / XAMP), there are no more options for them, see here for more details,
Here are the steps that I used to create ERD from DB-
- Go to configure PHPMyAdmin, usually
"http://localhost/phpmyadmin" on your local computer. (when using mamp it will be http://localhost:8888/phpmyadmin/ ) - Select the database for which you want to create.
Select "Designer" in the last menu item of the additional section, i.e.

(OR)
if you use (MAMP / WAMP / XAMP Phmpmyadmin) then-

You will be taken to a page with various options for creating ERD. 
- When you are done creating the ERD, click on the βExport Schema β (MAMP / WAMP / XAMP) coordinates for the PDF scheme.

(OR) click the "Import / Export Coordinates for PDF Schema" icon, which is the second largest in phpmyadmin.
Hope it works !!!
source share