The model name and reference designators can be modified with the labels tab.
If the the reference designator is changed, make sure there are no duplicate ones. See the Spice3f5 manual to see the format, as the reference designators first letter must be chosen specifically.
Parameters
.subckt parameters can be modified in the Parameter text field. The syntax is:
Parameters: param_name1=param_value1 param_name2=param_value2
e.g.
Parameters: c=1.4n r=2k2
For this to have any meaning, the .subckt must have parameters specified somewhere in its circuit description.
Note that no checking is performed. Symbols may carry over parameters for prior attached models. These parameters should be deleted.
For more detailed information see Subckts