I need help regarding backup exec 15

Hi all 

We was using symantec 2010 R3 version in our company for backup but now we download and install backup exec 15 trial version which we will purchase after some tests on our server 2012.

we have 2 external hard drives on which we take backup 

We test everything and it working fine but the problem is how to change the path of backup files on drive. i tried alot but failed. it automatically doing backup on previous configrations which i want to change ..i am sending you the attached pictures where i need help.

I tried alot but fail so please guide me