To edit a file:
In the Tree pane, find the file that you want to edit.
For details, see Retrieving Files from the Depot.
Right-click the file and choose Check Out.
When you open the file for edit, it is placed in a changelist.
Using the editor associated with the file type, make your changes.
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.)
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, 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.