I have created a Firbolg Trickster Domain Cleric in DnD Beyond.  I believe Clerics can ritual cast and Detect Magic is a spell that can be ritually cast.  However I noticed that the Detect Magic that is auto assigned to the character I created does not have that Ritual Cast icon next to it.

However if I go to Spells and add that spell the Ritual tag is there.  So can I not ritual cast Detect Magic that the Firbolg comes with?  Do I have to select it as one of my spells to be able to ritually cast it?

The ritual caster feature for cleric says:

Ritual Casting

You can cast a cleric spell as a ritual if that spell has the ritual tag and you have the spell prepared.

Spells known through non-cleric features such as firbolg magic are not prepared spells so do not qualify

Gotcha.  Thank you for the clarification.  Makes sense.