Adding a photo to your Instagram Photo Maps is easy. Just when you click a photo using Instagram App, add the filters that you want and then you can add it to your Photo Map by 'turning on' the Add to your Photo Map setting. Simply slide the button on right  to turn it on.

There are three type of Location sharing

1. General location sharing - When you turn on the 'Add to Photo Map' setting, it'll identify an approximate (longitude & latitude) location of your photo. The photo will then appear in your Photo Map at that location.
2. Specific (blue text) location sharing - After you've turned on the 'Add to Photo Map' setting, you can add a specific location by typing the name in 'Name This Location' field. As you start typing, a list of nearby locations will appear for you to choose from.When you tag your photo with a specific location, people viewing your photo will be able to see exactly where you took it.
3. Custom (blue text) location sharing - When you don't see a specific location listed after you type the name, you can create a custom name for it and then link it to general latitude & longitude of your photo. Type the location into the bar that says Find or create a location to give a custom name to that location.

Note: Your custom locations aren't available for other people to use; they're for your own use. Others won't be able to see the custom locations you create.