I need help producing a Mann-Whitney U test in SPSS 24.

Here is the table:

Method	Gain score
one on one	16
one on one	13
one on one	16
one on one	16
one on one	13
one on one	9
one on one	12
one on one	12
one on one	20
one on one	17
Small group	11
Small group	2
Small group	10
Small group	4
Small group	9
Small group	8
Small group	5
Small group	6
Small group	4
Small group	16

Could any please tell me how to do this step by step in SPSS ? How would you do it for a column of strings and a column of numeric only?