[Claudius]

To cast spells you also need to prepare the spell ahead of time. On the left menu bar click on the wizard spell book (there is also a priest scroll for priest) and then fill in all the boxes with spells of your choice. Now Rest. Now the moon and stars should light up which is what you click to cast the spell.

I haven't tried identify yet but it might not be handled as a combat spell. This would mean it doesn't light up the moon and stars. I would think in that case that you right click an item and choose identify box.

You also sometimes need a minimum casting stat in games but I think this addition of DnD gives you the score automatically that you need as a bard to cast first level spells.