Race and subrace, class and level, background, how you are rolling your scores, and your skills. Every option says what it does, so you can pick a class off the card rather than looking it up: the hit die, the two saving throws and how many skills it gives are all on it.

The last step hands you the ordinary builder with everything filled in and a summary of what was chosen. Change anything you like, then press Create character. Back works at every step and never loses what you typed after it.

Point buy counts your 27 points as you type and says how many are left. The standard array is checked as a set, so using 15 twice is caught rather than quietly allowed. Rolled scores go in as they are.

A Hill Dwarf gets its +2 Constitution and its +1 Wisdom, and the Half-Elf gets to choose which two abilities go up. Hit points use your class die and your Constitution, including Dwarven Toughness for the levels you have.

An Elf Ranger already has Perception, so it is off the class list: 5e says pick another one, and a builder that lets you waste a choice is worse than one that does not offer it.

A Rogue is asked after its skills are chosen, over everything it is proficient in, including the two from its background.

The nine races and twelve classes in the SRD are the ones on offer, and Acolyte is the one background it carries. A custom background is there for everything else: pick two skills and settle the rest with your table.

If you are copying in a character you already have, Blank sheet on /dnd goes straight to the form, and the D&D Beyond import is unchanged.