Where can I update my interests and skills lists?

On the Spacecubed Platform, On the left side menu bar, under Profile, click your profile image or your name.

Your details page will appear for you to update your relevant details.
 

Scroll down to "Skills" and/or "Interests".
Choose the tags that are relevant to you (keeping it to a maximum of 5 is recommended).

Click "Update Details" and you're done!