I helped a friend sell pots and pans at dinner parties and made $450. I dont have a business address - should I enter my home address instead?

If this qualifies as Casual employment, you don't have to enter a business address. There is a question in the profile section for this: "I received tips or did casual labour and will not be getting a t4"

Note: Casual employment is temporary, occasional work that is not regular. Typically, you do not receive a T-slip or receipt for this type of work. Reporting this income gives you more RRSP contribution room and increases your CPP pensionable earnings. It may also increase your GST/HST credit.

what if a t4a had been administered, can a person just bypass and enter as casual labour?  the amount is for less than this example...