How do I ripen a Mango?
You can let it ripe at room temperature.

If you want to slow down the ripening process, put it in the fridge, although this will affect the mango negatively. If you want to speed up the process, put it in a bag with a banana.

When the mango is ready to eat, it will be slightly soft if you press it and you can smell the mango flesh through the peel. The green colour will not totally disappear.