Set up / Setup
Different formsSet up is the verb; setup is the noun or adjective. If you can put “to” before it, use two words.
Set up
Use when
You need the verb meaning arrange, configure or establish.
Example
“Set up multifactor authentication before launch.”
Setup
Use when
You need the noun or adjective for an arrangement or configuration.
Example
“The setup guide explains the initial account configuration.”
Quick check
setup the account, set-up the account, complete the set up
Usage note