Question

how to add the sale of my manufactured home to my taxes? It was gifted from my parents and we used some of that money for the down payment of our house we got last year?

and some of the money went into our account

It may be excludable as sale of main home.

If it was your main home that you lived in 2 out of 5 years, you may not need to report the house sale at all. See Topic No. 701 Sale of Your Home.
If you lived in the home less than two years, you may qualify for one of the exceptions. For further information and examples, see IRS Publication 523, Selling Your Home. Does Your Home Qualify for a Partial Exclusion of Gain.
TT - Is the money I made from a home sale taxable?

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