Here is a helpful video walking you through setting up the VolAvgChart indicator on Tradestation.
The VolAvgChart indicator is will display intraday volume compared the the average volume for that day.
This indicator is meant for intra-day charts and will not display correctly on daily or higher time frames.
If this indicator is not displaying correctly on your Tradestation chart, the likely cause is that there is not enough data loading for the indicator to display properly.
Please see video above for instruction on how to adjust those settings.
Volume Average Indicator in TOS
General Installation Guide for Tradestation