So, I may be stupid or something, but when i try posting my Moon Cleric homebrew subclass, i keep getting this 

> This Subclass cannot be shared with the community for the following reasons:

• This homebrew Subclass has data mapped to it that is licensed content or private homebrew. This typically occurs when licensed or private homebrew spells are linked to the Subclass.
   

what do i do to fix this? 

Remove any spells you mapped to it that are not on this list: (https://www.dndbeyond.com/spells?filter-class=0&filter-search=&filter-verbal=&filter-somatic=&filter-material=&filter-concentration=&filter-ritual=&filter-sub-class=&filter-source=1&filter-source=4). Those are the “free access” spells, anything not free access cannot be attached and you still publish it. You can still use it, anyone in the same DDB campaigns with you can use it, and our homebrews are automatically shared within campaigns, you just can’t publish it with non “free access” content mapped to it.

oh, thank you! 

wait, what does mapping spells do? is it required to map spells?