How can I change the labels of SOM sample hits and SOM input planes?

I would like to change the labels which appear in both figures. In SOM sample hits I want to show the names of my samples but I don't know how can I get it. When I run my SOM program, it show only numbers, I need it show the names of my samples correspondent to these numbers. In Som input planes, I want to show the weights of my variables, it means, instead appearing weigght of input 1, I want it sais "pH" for example.