The newly installed theme now need to be activated in the Magento Admin panel. To make it your default store, you have to follow those steps:
Step 1: Navigate System > Configuration, open GENERAL > Design section
Step 2: In Design section, click to open tab Package, in the Current Package Name field, please enter the name of design package "arw_forward" (not including double quotes) then click Save Config button at the upper-right corner.
Step 3: Flush Magento cache and any other cache you have in your Magento installation.
Browse your Magento store front to make sure the ARW Forward theme is working on it.