I was trying to earn a 'Custodian' badge? The description for the badge tells:
Completed at least one review task. This badge is awarded once per review type.
What does it mean exactly? Thanks in advance....
To earn the custodian badge you need to review one suggested edit. Basically someone suggests a edit to a question to improve it but it has to be checked first by someone else to make sure it is a suitable edit and this is what the reviewer does. But in order to review suggested edits you need at least 2k reputation first (Unless someone edits your posted question and you review it, you can get the badge this way but you have to be quick and do it before another reviewer does ). You could try earning the Editor badge first if you haven't yet, basically you have to edit a question, this could be correcting grammar or editing format etc. Hope this helped!