Contribution to retirement

Your contribution is limited to your earned income. 

Is your earned income from W2 wages or 1099NEC self employment?  If you have self-employment income you can only contribute up to your net profit reduced by the deduction allowed for the ER portion of your self-employment taxes. The 1/2 SE Tax amount will be on Schedule 1 line 15 which goes to 1040 line 10.

See IRS publication 590A for IRA contributions
https://www.irs.gov/pub/irs-pdf/p590a.pdf

Thanks for the response.  It will be a w2. 

Do I just call my broker and make a contribution??  Will I get a form from him to put on my taxes to reduce the MAGI??

Yes, call your broker to make the contribution. Typically you may receive a form proving you made the contribution but not always. The IRS will take your word that you made this contribution before the due date of your return.