<< If you download the ITF file from your link and import the strategy then you will get full functionality. >>

I don’t know how to download the indicator or where to look other than the page referenced above.

You are right about the typo.

I wasn’t looking for the “Length” parameter.  Instead, I was hoping to get the missing operators, like + – / * etc. inserted in line 1.

In the AverageTrueRange part of line 1, there is no delimiter like a comma that separates the (AverageTrueRange[l](close)) function from the assigning property (close) that is contained with the parathesis of that part of line 1.

Thank you for your reply.