Getting Error on Installing WP Mobile Detector

Hello Everyone

Upon installing WP Mobile Detector, I am getting this error message at the top of every page which says:

Please set the permissions on this folder (/home/content/p3nexnas06_data03/04/2174304/html/wp-content/plugins/wp-mobile-detector/cache/) to be 777 to allow the WP Mobile Detector to work properly.

Execute the following command via SSH:
chmod 777 /home/content/p3nexnas06_data03/04/2174304/html/wp-content/plugins/wp-mobile-detector/cache/

Please advice what is to be done to get this plugin successfully activated…Also bear in mind that I am a complete newbie at wordpress and also my html/CSS/PHP knowledge is at a bare minimum…so i’d be really grateful to whoever treats me like a grade-schooler in the advice process…:)

Thanks in advance