Using Google API Markers in a Key/Legend Table

Hi Everyone

I have a number of Google Maps in my site https://johnbensontravels.com . A webbuilder put some keys/legends above the maps using the different coloured Google API markers to show that, for instance, I travelled by bus (blue marker) from X to Y & train (red) from Y to Z.

I am unable to get hold of the webbuilder to add further API markers to the table. I was wondering if anybody else knew how to do this. You cannot copy & paste, nor do I seem to be able to find any code, either. Can anybody help?

Thanks
John