Log into Mapbox to find your username (it's not your email). This is only used for advanced functionality, like if you are creating tilesets from your data.
Mapbox Secret Token [Mapbox, Pro]
This is only for advanced functionality like managing tilesets. Make sure you have given this secret token the correct permissions.
Store Locator [Pro]
You must enable this if you are using the Store Locator functionality.
User Submission [Pro]
You must enable this if you are using the User Submission functionality.
Editing Map Style [Pro]
If you want to have a different default map tileset appear in your Points, Lines, and Polygons pages — instead of OpenStreetMaps — enter the style from Mapbox here.
Default Shortcode Map [Pro]
If you are creating shortcodes for individual features or sets of features, then you usually have to enter an ID for a map you've created so they can be displayed on that map visually. Here, you can specify a default so your shortcode won't need to have that specified.
Default Map View [Pro]
Manually set the starting view of all new Maps.
Spatial API [Pro]
Turn the Spatial API functionality on and off here.
Encoded Geometries [Pro]
Currently in development, this may help speed up your map load if you have lots of complex shapes.
Tileset Management Format [Pro]
This is a very advanced feature that allows you to specify properties to be attached to the features you send to Mapbox. Please see the Mapbox Tileset Management page for more information.