I could see that a file is in read only mode.

how can change the permission to read write mode and update the file..
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chmod 777 filename wil give everyone possible to read write

the number are in order to determine permission for user   group  anonyme

you can get more info at 

Use command chmod 775 file name

After that again change to read mode 444

Rem :

Read - 4
Write - 2
Execute - 1
Total - 7

and 777 or 774 means three groups :

First 7 - Owner of file
Second 7 - Owner Group
Third 7 - Others

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