Problem Installing a Plugin

Hi, Team,

I have a quick question from you: I have been trying to add the classified plug in to my site, but unfortunately, I keep getting this message.

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 30720 bytes) in /home/brazilo1/public_html/brazilnyc.com/wp-admin/includes/ms.php on line 161

How can I go about fixing this issue? Any help or tip would be appreciated, but I am aware this is certainly a problem with my site or hosting service, and not an issue with your coding. Still, any help would be appreciated.

thanks!

Rodrigokino