[Hampshire] new user - setenv source question

I am new to using Linux and am trying to set the environment varibles
using the setenv and source commands. So this is probably an easy one to
answer!

I get the following error when trying set the source command:

$ source $Z7PATH/lib/Z7_cshrc
/home/anna/Zebulon/Z8.4.3/lib/Z7: No such file or directory.

I have already set $Z7PATH as an environment variable. However it seems
to be looking for Z7 not Z7_cshrc?

Thank you in advance for your help,

Anna