Settings > Links & Attachments > Add New Link

Then Follow the Attached Image.

This will create a button the Lead and Client View Pages that opens up a Google Map of the Address.
Note in the screen shot that you will select the Link to display on the Lead & Client Views. You will use the Link Method "Get" and enter a field name then the parameters of #Address# #City# #State# #Zip# in one cell.

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