Did you already start a 2023 return before Oct 15? How to finish a return you started online
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
If you can't get the side menus to open up to access the prior year..... You need to start entering some basic Personal Info in 2023 for the side menu to open up. Just continue a little ways into 2023.
Then when you do file 2024 enter 0 for the 2023 AGI since you are filing 2023 late.
