Replace "[SkypeName]" above with the name you got from their profile in the section above this one.

If you do those simple two steps above, you'll set the person into the Administrator role, so that they can also remove people from the group (and can add more people as Administrators).

What if you're not an administrator in the group? You're going to need to ask the Creator or another Administrator to add you as an Administrator. It will help them if you give them the full command line in advance, including your Skype Name. Most people don't know how to do this.