Here is a simple label you can add to any chart with a custom description. See download link below:
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Within the label you can add a description label to the upper left corner of your chart. With the simpler label, you will need to import again and re-name it to add a different label to another chart.

​Add a descriptive label to the upper left corner of your chart. Customize the text.   With the simple label, you will need to import again and re-name it to add a different label to another chart.

Import the label into TOS. For help, use the search bar on this page and search for "TOS install". To customize the text of the label, open the edit studies and strategies window.   Find the label in the list on the left side of the window. Add the label to the chart by left clicking on the name of the label and then "Add Selected". Or double left click on the the name.