Does anyone know how I can add a homebrew spell to my character's spell list? I can't seem to find a way and would rather that I had it ready and on dndbeyond so I don't forget months down the line. 

Thanks in advance! 

Solved. End thread.

make sure the tag of the home brew spell is available for that class, or you can add it directly by adding it directly to the class, some spells need to be available for certain classes for them to be usable for said class, eg. wizard, and sorcerer tag, the spell chromatic orb has those tags, meaning that spell can be available for those classes. 

Meanwhile if your class is a non spell caster class like a fighter, rogue, barbarian. you have to have to either edit them or make a cantrip that gives you spells based on level or cast at will.

I suggest you read the new player guide for more info.

you can also add the spells in the subclass creation at the most bottom of character basic info at the "additional specific spells" which grants access to extra spells that are not commonly found in that class, eg. wizard i added 'eldritch blast' at the specific spells at it making my spell list expanded to have that certain spell.

i dont seem to have any additional things even though i have added the homebrew content to my collection how to i add it to a campaign ? do i have to be a dm

Do you have the Homebrew checkbox enabled on the Home tab of the character builder? What specific homebrew thing are you trying to add?