You can choose which skills to display in the grid by clicking on Modify Preferences.
The Modify preferences page contains a Skills to display box. For example:
Clicking inside the selected skills box will open a drop-down list of all available skills that can be selected. For example:
After you have made your selection, click Submit to save your changes and return to the updated Group skills page, or click Cancel to return to the Group skills page without saving any changes.