If you are saying that your ex now lives in Minnesota, start by reading the statutes (548.26 through 548.53) at:
https://www.revisor.mn.gov/statutes/?id=548
Then check the county court website in the county where you ex lives and see if there are forms and instructions.
Once you get the judgment "domesticated" you can begin whatever enforcement procedures are available.
Not so!
The Uniform Enforcement of Foreign Judgment Act (UEFJA) does not apply to "Ordered spousal maintenance"! A money judgment issued covering an established arrearage stemming from a decree ordering spousal maintenance would come under the Act, but not the underlying order itself.
What is applicable here is the Uniform Interstate Family Support Act (UIFSA) *
(Twice within in a week you have taken the OP 's mischaracterization of the subject for granted and sent them off further misinformed. Recently a
QDRO as representing an obligation of the debtor under Section 523(15) of the Bankruptcy Code as not dischargeable and here a "
Foreign Judgment" as a "
spousal maintenance order" subject to registration and enforcement under the UEFJA.)
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[*] Texas Family Code Title 5 Subtitle B Chapter 159 Subchapter B - Minnesota Statutes Chapter 518C