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If you want the location of your contacts to be able to be displayed on a map, use the standard Address field which is automatically included on your Contact Form
Steps
Select My Apps in the top menu.
Select Contact Forms.
You arrive on the Contact Forms page.
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Press the cog icon next to the name of the Contact Form.
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A menu appears. Press Edit.
You arrive on the Edit Contact Form page
From here you can
Change the Contact Type by selecting the radio button ie., whether you want the contact form to be about A Person, An Object, An Organization, or An Animal.
Change the role or create a new role by selecting Create a New Role from the drop-down list.
When you select Create a New Role, a pop-up appears, asking you to enter the Role's name.
Once you have entered the name of the Role, click on Save. A new role is created which you can now use to edit the contact form.
Edit the Name of the Contact Form.
Create a new field (press the Add new field button shown by the red arrow)
Find an existing field to add to the form (Use the Search bar and/or the Field filter checkboxes in the Find a field section. Do not press the Enter key. Search results will appear to the right of the Field filter checkboxes)
Remove fields from the form (press the X symbol shown to the right of the field in the Your Contact Form section)
Reorder fields on the form (press the Up/Down arrows next to the fields in the Your Contact Form section on the right)
Change the input type for a List field, e.g. from Single Choice
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to Limited Multiple Choice or Unlimited Multiple Choice
Make a field mandatory or optional. (By default, all fields aside from Name are optional. To make a field mandatory, click the Mandatory tickbox shown below the name of the field in the Your Contact Form section)
After making changes, scroll to the bottom and press Save
You are returned to the Manage Contact Forms page