As the Group Manager, to remove a member from your Group, go here or here.
Under the "Options" column you will be given the opportunity to 'Remove from Group', select that for the member you wish to remove, and confirm.
Important: Under the General Data Protection Regulation (GDPR) a member's personal details remain their property, regardless of who created the profile. If they request group removal or that you put their personal information out of and beyond use, you are obliged to do so.