when creating a character, the battle master subclass for the the fighter isn't an option. along with that, the outlander isn't an option for background.
the option to use playtest content does not give you the class options artificer and mystic.
Battle Master and Outlander aren't provided in the free rules from Wizards of the Coast. You have to buy them in the Marketplace (or type them in yourself as homebrew for private use.)
See here for what kind of Unearthed Arcana content is available.
The feature/subclass/race you are referring to is not part of the D&D 5th edition SRD and will need to be unlocked from the marketplace before you can use it on D&D Beyond.
when creating a character, the battle master subclass for the the fighter isn't an option. along with that, the outlander isn't an option for background.
the option to use playtest content does not give you the class options artificer and mystic.
Battle Master and Outlander aren't provided in the free rules from Wizards of the Coast. You have to buy them in the Marketplace (or type them in yourself as homebrew for private use.)
See here for what kind of Unearthed Arcana content is available.
The Forum Infestation (TM)
The feature/subclass/race you are referring to is not part of the D&D 5th edition SRD and will need to be unlocked from the marketplace before you can use it on D&D Beyond.
D&D Beyond can be used for free and contains information from the following "free to use" sources published by Wizards of the Coast: D&D 5th edition SRD, D&D 5th edition Basic Rules, and Elemental Evil Companion.
Content from other sources, such as the Player's Handbook, Dungeon Master's Guide, or Monster Manual, will need to be purchased from the Marketplace or accessed via another user sharing content with you via their Master Tier Subscription.