How can we convert a function without a parameter into a one-parameter function?

https://www.slideshare.net/ScottWlaschin/fp-patterns-ndc-london2014 says

Bad news: Composition patterns only work for functions that have one parameter!

Good news! Every function is a one parameter function!

We can convert a function with two parameters into a function with one parameter, by partial application. For example

let add x y = x + y 
let add x = (fun y -> x + y)

let add1 = (+) 1  
let three = add1 2 

How can we convert a function without a parameter into a one-parameter function?