Google Sheets - Creating Graphs with multiple lines

[Carol LaRow]

Need help with a Google Sheets Question:

Attached is a picture of a possible set up for creating one graph with multiple lines (series) on one graph.

1) How can we add more than one line to a graph?

2) How can we switch or update the  x-data or y-data?

 

In Excel you can simply right click on graph and click select data then a new window pops up showing the data series added to the graph.  You then can edit each series or add more.

 

How can you do this in Google Sheets ?

What am I doing wrong?

Thank you,

Carol