ArcGIS Online viewer: 'change symbols' not available for selection

Discussion created by AGOL@CEC on Aug 24, 2011
Latest reply on Aug 3, 2015 by wroe
Branched to a new discussion
I created a simple map in ArcGIS Online viewer. I added a layer from our AGS and then went to re-symbolise but the 'change symbols' window is not available when I click the arrow. Is this something to do with the type of AGS service I'm using?

Apologies in advance - I'm brand new to most of this so may have missed a step.