Virtue mart currency change

I was trying to change the default currency Euro to USD Dollar from the joomla 2.5 esport template but failed. whenever going to component>virtuemart>Shop>shop its seems the following error "Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 130968 bytes) in /home/mlokey/public_html/dev/libraries/joomla/client/helper.php on line 168"

Error screenshot here: http://s14.postimg.org/r0ou9giv5/error.png
How can i solve this?

Regards

Hello,

I'm sorry but it is a problem for the VirtueMart Technical Support not for us.