First of all the actual Shared Parameter must be created first so that it appears in the data grid on the Family Parameter tab of the ribbon and then you can define the Parameter Properties respectively.

Select the required Shared Parameter(s) from the SPM data grid that you are wanting to edit.  You can either select individual parameters or multiple parameters at a time and then click the Parameter Properties button from the Ribbon.

SPM Parameter Properties button

Depending on whether you have selected an individual parameter or multiple parameters the following Define Family Parameter dialog box will look slightly different.  Enter or Edit the required Family Parameter values as required and click OK to exit the dialog box.

In the data grid you will then see the columns populated with the data entered.

Note: the family parameter data entered does not get permanently stored in the SPM SQL database even though it is displayed at the time in the data grid.  If you exit out of SPM and go back in the columns in the data grid will be blank again.