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By clicking 
this button three selections appear for adding overlay as it shown below ;
Text Overlay
- Edit Profiles > Choose the profile which you want to add overlay > click Overlay tab
- Click this button , then click Add Text Overlay section, following settings appear as it seen below.
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Font : Font of the overlay text.
Variable Text :
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This option is available when there is no tag in text field. Variable option is used
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to change the text of current overlay from remote TCP commands. This option is useful when there
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is a need to dynamically change the overlay text such as camera angle etc.
Max Text Length : This option is used with Variable Text option and shows max text characters for current overlay item.
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