So the main php.ini file will be found at:
We're going to edit that file now:
Scroll down in that file until, one at a time, you find and change the following settings:
; Maximum amount of memory a script may consume (128MB)
memory_limit = 256M
; Maximum size of POST data that PHP will accept.
post_max_size = 256M
; Maximum allowed size for uploaded files.
upload_max_filesize = 256M
Set all 3 of those settings to 256M
and save the file.