How to edit the php.ini file in Ubuntu 19.04 (Disco Dingo)

Consider:

Now I am getting this error. How can I resolve this issue?

I found found some related issue, but that told me change max-size inside file php.ini, so how can I edit file php.ini (phpmyadmin-config)?

Importing into MySQL, the database size is above 100 MB. And the MySQL database size converts it into a ZIP file, and then import working, but it is not inserting all tables.