Your code includes the option PLOTS=(CUMHAZ), which means that you are only requesting the plot for the cumulative hazard function. See the documentation for the other plots that you can request.You can also browse the Examples section of the documentation to see if your plot appears in any of the examples. If not, see the doc for the OUTPUT statement and create an output data set that contains the statistic that you want.
To specify the placement of the knots, see the article "Regression with restricted cubic splines in SAS". It sounds like you might want the LIST option: such as
KNOTMETHOD=LIST(0, 6, 12, 24)
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