Upgrading PHP 5 to PHP 7

I have EasyEngine 3.8.1 PHP version 5.5 is the one that is running but 7,2 is installed. What steps do I need to take to get PHP7 running as the main php version ?

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Here are the results of :~# dpkg -l | grep php

ii php-common 2:69+ubuntu14.04.1+deb.sury.org+1 all Common files for PHP packages
ii php-gettext 1.0.11-1 all read gettext MO files directly, without requiring anything other than PHP
ii php-pear 5.5.29+dfsg-1+deb.sury.org~trusty+3 all PEAR - PHP Extension and Application Repository
ii php5-cgi 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 server-side, HTML-embedded scripting language (CGI binary)
ii php5-cli 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 command-line interpreter for the php5 scripting language
ii php5-common 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 Common files for packages built from the php5 source
ii php5-curl 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 CURL module for php5
ii php5-fpm 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 server-side, HTML-embedded scripting language (FPM-CGI binary)
ii php5-gd 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 GD module for php5
ii php5-geoip 1.1.0-2+deb.sury.org~trusty+1 amd64 GeoIP module for php5
ii php5-imap 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 IMAP module for php5
ii php5-json 1.3.7-1+deb.sury.org~trusty+1 amd64 JSON module for php5
ii php5-mcrypt 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 MCrypt module for php5
ii php5-memcache 3.0.8-5+deb.sury.org~trusty+1 amd64 memcache extension module for PHP5
ii php5-mysqlnd 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 MySQL module for php5 (Native Driver)
ii php5-readline 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 Readline module for php5
ii php5-xdebug 2.3.2-1+deb.sury.org~trusty+1 amd64 Xdebug Module for PHP 5
ii php5-xmlrpc 5.5.29+dfsg-1+deb.sury.org~trusty+3 amd64 XML-RPC module for php5
ii php7.2-cli 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 command-line interpreter for the PHP scripting language
ii php7.2-common 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 documentation, examples and common module for PHP
ii php7.2-fpm 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 server-side, HTML-embedded scripting language (FPM-CGI binary)
ii php7.2-json 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 JSON module for PHP
ii php7.2-mysql 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 MySQL module for PHP
ii php7.2-opcache 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 Zend OpCache module for PHP
ii php7.2-readline 7.2.15-1+ubuntu14.04.1+deb.sury.org+1 amd64 readline module for PHP