Self-employed retirement contributions

I am working on my 2024 return and am self-employed.   I originally entered a contribution to a Traditional SEP, but then I learned that my investment account is actually an Individual 401k.  When I tried to change the entries in Turbo Tax it won't allow me to eliminate the SEP contribution and if I add the 401k it show double the amount that I intend to contribute.   How can I remove the SEP contribution and only claim the 401k?