Savin an OTRS DTL file on LINUX

This is my first implementation on Linux and I'm having some troubles...  

I've just edited the AgentTicketPhone.dtl but I can't save it... I guess its because the OTRS process are running (just a guess hehe). The file appears with a big lock on it. 

I'm using OTRS 3.1.7 with UBUNTU Linux Server. 

Can you guys help me out??  :) 

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