I don't understand the question...on page titled Retirement Contribution Allocation...Amount of Contribution Attributed to this business?

[celine2cat]

?

[DawnC]

TurboTax is asking which business, the contributions you are entering, are for.   Do you have multiple sources of self-employment income/businesses?   Make sure you are entering your contributions in the correct place.   Instructions are linked below.  

Self-employed retirement plans: 

• To enter SEP IRA contributions
• To enter Solo 401k contributions

If you are not self-employed:

• and want to enter contributions to a Traditional or Roth IRA, follow these instructions.
• and need to enter IRA distributions reported on Form 1099-R, follow these instructions.