Income code 42 from 1042-S

Trying to file income taxes and the code in box 1 on my 1042-S is 42 (earnings as an artist…) do you recommend entering this amount as “other income” or will it be as if I’m “self-employed” ??

I’m a US citizen, I made money from a Canadian company and they gave me this form for my filing, the 1042-S.

Is there a minimum income that doesn’t require you to file with this form?