Archiving admins on Hero is simple. Firstly, click 'Settings' in the Hero toolbar.
Next, click 'Admin accounts' as highlighted above. Once you have reached the 'Admin accounts' table, click 'Archive' to archive your chosen administrator.
The administrator will then be moved the the 'Archived' table, which can be found by clicking the 'Archived' button at the bottom of the 'Admin users' table.