Have RRSP slip fr the 1st 60 days of '23 - not used in '22 taxes. Doesnt seem there is a category (in drop down), only Mar to Dec '23 or 1st 60 of '24. What do I do pls?

If you made RRSP contributions during the first 60 days of 2023, then those would go on your 2022 return. If you NETFILEd your return then you can use ReFile to add the contributions.