2024-2025 tax return not yet submitted

I'm a landlord with over £50,000 income in 2024-2025. I haven't yet done that tax return. Can I use this software to record my income and expenses for that tax year and submit the corresponding return, or must I first submit the return using the old method?

My tax year begins on 6 April. If the answer is that I must first submit the 2024-2025 return, can I start now inputting the expenses from 6 April 2025 in ClearBooks?

Thanks in advance for the reply.