On the toolbar, click Properties, and then click the Sources tab.
In Source from, click Devices.
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To insert script commands while sourcing from a file, click Both device and file.
Select the Script check box, and then click Script Panel.
Click Apply, and then click Start Encoding.
On the Script panel, click the button for the kind of script you want to insert. You can insert a caption (text string), URL, or custom script command.
Do one of the following:
If you are inserting a caption or URL, type the text or URL that you want to insert.
If you are inserting a custom script, type the script command type and value.
Click Insert at the point you want to insert the script into the stream. The Total scripts entry on the Monitor panel increments with each script command that you insert.