And yes, it's absolutely correct to go with "...they will do this" when referring to a hypothetical genderless user. Defaulting to 'he/him' (and presuming a gender) is less and less acceptable.

>"Imagine you have a user who wants to sign up. After (___) sings up"?

"After they sign up, ..." works there and can be used to refer to the singular person. Just make sure the verbs agree ('they sign' vs 'she signs').

One other thing I'd note: you'll almost never hear a native English speaker use the phrase "fill the form".

Now, whether a person opts for 'fill in' vs 'fill out' is another question and seems to vary by english region.

https://english.stackexchange.com/questions/1514/fill-out-a-...

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In portuguese, "the user" has a gender as well ("o usuário" i.e. "(the male) user"). We usually ignore linguistic gender in most places, which causes all sorts of confusion to people coming from countries where nouns are "un-gendered".

You can use "they" as a singular pronoun.

You can use "one" like: "if one wants to do this, one will do this."

You can use "his or her" like: "if the user wants to do this, he or she will do this."

Some writers like to rotate "he" and "she". So sometimes they write "if the user wants to do this, he has to do this first." Then later, in another paragraph, the writers write, "The user doesn't like this widget. She prefers that widget."

"If the user wants"

but

"If they want"

Superb, thank you!