When suggesting a goal to your student/mentees you have the option to save the goal to your personal Goalbank for future us. However, you can also create goals without assigning them simply by pressing the 'Goals' button.
From here you can Create a new goal, or edit an existing goal.
Create a new goal:
To create a new goal, populate the fields and choose a category then hit 'Save as New':
Edit existing goal:
To edit existing goals:
After updating the goal you can either save the update, or save as a new goal to create a new version and maintain the original: