From Memberships, select the Members tab.
Select the General tab.
Click on the Member Name to whom you need to add a member type.
On the member details page, click Add New Member Type or Role.
Select the Membership by clicking on the magnifying glass icon.
Click on link icon to add that membership.
Select the Member Type by clicking on the magnifying glass icon.
Click on link icon to add that member type.
This will add the member type to the member.