Edit files
To edit a file:
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                                                    In the Tree pane, find the file that you want to edit. For details, see Retrieving Files from the Depot. 
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                                                    Right-click the file and choose Check Out or Check Out and Open. When you check out a file, it is placed in a changelist. 
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                                                    (Optional) To prevent others from submitting changes to that file, right-click the file and choose Lock. When a user is connected to an edge server and locks a file, the lock is global, meaning it is promoted to the commit server. Therefore the locked status is visible to users connected to other edge servers or to the commit server:  A file remains locked until the file is submitted, reverted, or unlocked. 
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                                                    To launch the associated editor, double-click the file or right-click and choose Open With. (You might need to associate an editor with the file type. To define an editor: choose Tools > Preferences, click the Editor tab, and specify the desired editor for the file type.) 
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                                                    Using the editor associated with the file type, make your changes. 
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                                                    To place your revised version in the depot so other users can have access to it, right-click the file and choose Submit​. In the Pending Changelist dialog box, enter a description of your changes and submit the changelist that contains the file. 
To display a file without opening it for edit, double-click the file icon.