How to Add Co-Admins to a Tumblr Blogby Naomi Bolton
Posting new content to Tumblr can be time consuming, but if you have a secondary blog you can ease the burden by appointing more admins. Unlike members, admins can invite or remove users and delete posts by other members. Co-admins are also allowed to make changes to the settings of your blog. Before you can promote someone to an admin, she must first be a member of your secondary blog. You can invite someone to become a member of your blog even if she is not a Tumblr user yet.
Sign in to your Tumbler account, and then click the down arrow next to the name of your primary blog.
Select the name of your secondary blog from the list, and then click "Members."
Type the email address of the person you want to add, and then click the "Invite to this blog" button.
Click the "Promote to admin" button next to the name of the person you want to add as a co-admin.
Click the "Promote user to group admin" button to confirm that you want to permanently allow the user to administer the selected secondary blog.
You cannot remove co-admins from your blog like you can remove regular members. Only appoint users that you know you can trust to be co-admins.