@Alma1 have a look at
help -> sample data -> Calculators -> Hypothesis test for two means
and follow the workflow (or excecute the script below).
For learning Purpose I would also recommend to construct a data table from the summary statistics and perform the t-Test from menu Analysis -> Fit y by x, and Read the explanations JMP gives.
Names default to here(1);
open("$SAMPLE_SCRIPTS\Calculators\TestTwoSampleMeans.jsl");
Georg