1. Click on the Legend in the Object Manager to select it.
2. In the Property Manager, click on the Entries tab.
3. Click the Edit button next to Add/remove entries.
4. In the Select Plots dialog, check or uncheck the boxes next to the plots to be added or removed from the legend.

5. Click OK. The plots are added to the legend.

1. Click on the Legend in the Object Manager to select it.
2. In the Property Manager, click on the Legend tab.
3. Click the Edit button next to Entries.
4. In the Legend Entries dialog, click the Add or Delete button. 
   1. If you're adding a plot:
   2. In the Select Plots dialog, choose the Graph containing the plot(s) you want to add.
   3. Click all of the plots you want to add and click OK.

5. Click OK. The plots are added to the legend.

Updated March, 2020