load the RSI as you would normally do out of either the Indicators or Custom Indicators then left click on the BB bands ( This 2nd indicator must come out of the Indicator folder only not the Custom folder ) and while holding down the left mouse button drag the BB indicator into the RSI window, then release the mouse button and the BB window will appear - then you will find a list under the parameters section in the ( APPLY to box ) click the arrow to the right of this window and a drop down will appear, select the "Previous Indicators Data" and the BB bands will load, you can load as many indicators over the top just by selecting " Previous Indicators Data or First Indicators Data " depending on which indicator you want each proceeding indicator to relate to.

Hope this is clear.