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Hey,

I've been trying to use Dark Ritual in Forge. I cast it from my main phase, it goes on the stack and then resolves. I now should have three B mana to use. I select a Duress to cast next but it prompts me to tap a Swamp in order to cast it.

The mana should be floating in your mana pool. Look underneath your avatar's image/lifetotal. You should see a Black mana symbol and 3 next to it (as long as you are still in your mana phase).

Oh I see now. I click the Mana symbols under the life total. I just did this and it worked. Thanks.