In 'webserver configure', select all phps in 'multiple php install' and then click their 'update'. After all php installed, set 'php56m' in 'php used'. Select 'php-fpm_event' for 'php type'. And select 'medium' (if using webserver proxy like nginx-proxy) or 'high' (if using pure apache).
And then go to 'switch programs' and select 'use apache 2.4' and 'use pagespeed'.