UK Averaging tax from a loss year and a profit year ? (musician)

[Paul Townsend]

Hello I have an enquiry regarding my (late) tax return. Last year I made a loss of £4,000, this year a profit of £36,000. I'm a musician and I'm trying to work what I need to do on the self assessment to average out the tax over this year and last year. I know it's pretty simple, but the language is slightly confusing on the form and I want to ensure I fill it out correctly. Thank you in advance!