Where do I enter the -$3000 which has been a carry over?

[MOTORHOMMIE]

It was a loss on an RV I sold that we lived in.

[DoninGA]

If this was a personal residence and it was sold at loss it is not entered on a tax return.

[SharonD007]

If you prepared your taxes in TurboTax last year, your capital loss carryover from transferred when you logged in. Capital loss carryovers result from investment losses.

Was your RV your primary residence?  The IRS doesn't allow you to claim a loss on your primary residence.  For additional information, refer to the TurboTax article Tax Aspects of Home Ownership: Selling a Home and Can You Claim a Boat or RV as a Primary Residence?

For information on capital losses, refer to the TurboTax articles; What is a capital loss carryover? , How do I enter my capital loss carryover?, and Capital Gains and Losses.