Allowed Memory Size

Hello :]
I really need help with this, I am able to see to site but when I log into the site through wordpress and try to edit the pages it gives me this fatal error message below. On all pages this message shows…

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 12288 bytes) in /home/vrparedes/public_html/vpmarketingsolutions.com/wp-admin/includes/post.php on line 1499

thank you for your help in advance!