i am encountering a simple problem that i want to remove the first input and i want to only connect slider as input.plzz help

SIMULINK FILE CAN EASILY BE OBTAINED FROM FOLLOWING MATHWORKS LINK
https://in.mathworks.com/help/supportpkg/rtlsdrradio/ug/spectral-analysis-with-rtl-sdr-radio.html;jsessionid=6a5e3e8b3cf8083d4d8a2587a119
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