Add Leader access to existing user

I am trying to use the “Add a leader page” to add leader permissions to an existing user. It seems that is the only way to add the following: “Grant TroopTrack admin privileges”, “Create money account”, “Grant privileges to update advancement data?”, “Grant privileges to manage money accounts”

When I go into this page to assign these to an existing user, it creates a new user. Is there a way to add these to an existing user? I haven’t seen anywhere where these quoted items are options to add to an exiting user.

Check out this post regarding Permissions.