Label on y axis needed when posting visualisation to a website

I am using the <iframe> code given in the "Embed in your website" box of the Visualisation page to insert graphs from Emoncms into my weewx weather monitor website.  It works nicely, but the graphs from Emoncms have no label on the graph and no label on the y-axis.   Is there a way to incorporate a heading and/or a label on the y-axis when inserting visualisations in another website?