mstl function not recognized

I am trying to see if my time-series data has trend / seasonality, and was attempting to use the mstl function to do so. However, after I load the ggplot2 library, it still says "could not find function "mstl"". Any help here would be great. I can supply the code I've been using as well if needed.

mstl() is not a ggplot2 function, forecast maybe?

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