how do I do that?
Hi there,
You’ll have to use FTP client or your hosting’s file manager. Please contact your hosting provider as they may able to provide more instructions about file editing. Example, https://www.siteground.com/tutorials/cpanel/file-manager/
Thanks!
how to upgrade PHP?
Hi There,
This depends on your hosting provider. Usually, if you are on a shared hosting environment, they will do it for you because it might affect all other hosted sites. It is best to consult your hosting provider to update PHP version.
See this guide: https://magazine.joomla.org/issues/issue-may-2016/item/3033-how-to-upgrade-your-website-php-version
If you are note familiar, please ask your provider to do it for you instead.
it got fixed. php memory limit
Glad to know that. Have a nice day! 
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