A Spell is a compendium entry for quickly identifying and reading through the abilities of a magical effect. Spells can be added, edited, and imported just like monster NPC stat blocks. To create a spell, start by clicking on the Spells icon on the navigation bar.
This will open up the Spells panel. From here, click the + icon on the top right to open up the Add Spell modal.
The Add Spell modal is essentially an in-place editable Stat Block for spells. If you want a spell to appear only in a specific campaign, you can set it in the Campaign field. Otherwise, it will appear in all of your campaigns.
Once you're done adding in the details, press Add to save your changes.