I wish to increase max execution time on my small wordpress site. I understand I ought to edit php.ini, but can't appear to locate it!

any tips?

Make use of the php_ini_loaded_file function to obtain the location of the php.ini file )

A php.ini file isn't installed automatically with Wordpress. You might have one already installed because of your hosting company. Try looking in your root directory or request your internet host or read your internet host's documentation regarding how to install one.

Search for max_execution_time inside your php.ini file and alter to 60 or 90

It can be done through the .htaccess file