To get information on distribution codes listed in Box 7 of Form 1099-R Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc. from your TaxAct program:
You can also check IRS Instructions for Forms 1099-R and 5498.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.