pls there's a friend of that needs your urgent. Can he use his asscociate degree to go for his masters?

N0, You need a bachelor's degree first

I think

so he will need too start a four year uni again?

In countries in which a master's degree is a postgraduate degree, admission to a master's program normally requires holding a bachelor's degree (in the United Kingdom, Canada and much of the Commonwealth, an 'honours' bachelor degree), although relevant work experience may qualify a candidate.

Source: Wikipedia

Depends on the program and the country.