Thanks for joining us here on the Community, Joebell
You'll need to enter all income and expenses relating to your business for the tax year and categorise these by selecting one of the default categories set in QuickBooks Self-Employed. These are created in line with HMRC's SA103F and will feed into your Tax Summary (which you can access from the 'Reports' tab) - you can use this to complete your form by filling in the corresponding boxes labelled 15-47.
You'll also need to tell us a little about yourself under your tax profile (cog > tax profile) so we can calculate your estimated taxes correctly in the background. :)
You can find more help & support on our Community here - please get back to us below if you have any Q's!