In step 5 above you will see various options that represent the plug ins.
To make more custom changes simply expand the section for the plug-in(s) you have chosen. The example on the right is for adding/removing data displayed in the main MySpeed tab.
As you can see it is as simple as removing or adding text from the text box that relates to various metrics.
When you have made all the changes you want click the save changes button.
Now when you view your published page you will see the changes you have made take effect.